Figure 1 MESSENGER data flow

5.3.4 Labeling and Identification

There is a corresponding detached PDS label file for each GRS CDR/RDR/DAP data file. See Section 6, Detailed Data Product Specifications for the sample PDS label files and a complete description of each label format. Detached means that the label file is separate from the data file, as opposed to being in the header portion of the data file.

The data set ID assigned by PDS to the GRS CDR/RDR data set is “MESS-E/V/H-GRNS-3-GRS-CDR-V1.0”. The data set ID assigned by PDS to the GRS DAP data set is “MESS-E/V/H-GRNS-5-GRS-DAP-V1.0”.

5.4 Standards Used in Generating Data Products

5.4.1 PDS Standards

The GRS CDR/RDR/DAP data products comply with the Planetary Data System standards for file formats and labels as specified in the PDS Standards Reference.

The GRS CDR/RDR data products include:

Data File - A binary or ASCII table object containing the data.
Detached Label File - Serves as a high-level description of the parameters that correspond to the table object.
A pointer to a FORMAT file, which describes the structure of the table file.

The GRS DAP data product includes:

Data File - An image object containing the data.
Detached Label File - Describes the parameters and structure of the image object.

5.4.2 Coordinate Systems

There are two coordinate systems in use:

the celestial reference system used for target and spacecraft position and velocity vectors and camera pointing, and

the planetary coordinate system for geometry vectors and target location.

The celestial coordinate system is J2000 (Mean of Earth equator and equinox of J2000). The planetary coordinate system is planetocentric. The planetocentric system has an origin at the center of mass of the body. The planetocentric latitude is the angle between the equatorial plane and a vector connecting the point of interest and the origin of the coordinate system. Latitudes are defined to be positive in the northern hemisphere of the body, where north is in the direction of Earth's angular momentum vector, i.e., pointing toward the hemisphere north of the solar system invariant plane. Planetocentric longitude is measured around the equator of the body from a prime meridian defined and adopted by international agreement, i.e., Seidelmann et al 2003. Longitudes increase toward the east making the planetocentric system right-handed. Radius is the distance from the planetary body's center of mass to the point of interest.

The list below describes the computational assumptions for the geometric and viewing data provided in the PDS label:

· The mid-point time of observation is used for the geometric element computations. (The mid-point is calculated using the Start and End times from the EDR set.)

Label parameters reflect observed, not true, geometry. Therefore, light-time and stellar aberration corrections are used as appropriate.

The inertial reference frame is J2000 (also called EME2000).

Latitudes and longitudes are planetocentric.

The "sub-point" of a body on a target is defined by the surface intercept of the body-to-target-center vector. This is not the closest point on the body to the observer where the observer is the spacecraft, MESSENGER.

Distances are in km, speeds in km/sec, angles, in degrees, angular rates in degrees/sec, unless otherwise noted.

Angle ranges are 0 to 360 degrees for azimuths and local hour angle. Longitudes range from 0 to 360 degrees (positive to the East). Latitudes range from -90 to 90 degrees.

SPICE kernel files are used in the geometric parameters (See Appendix: SPICE Kernel Files Used in MESSENGER Data Products.)

The spacecraft attitude during orbits and flybys is defined by two additional coordinate systems, the GRS LVLH (Local Vertical Local Horizontal) frame and the spacecraft fixed frame, and by the rotation of the spacecraft frame with respect to the GRS LVLH frame. The GRS LVLH frame is illustrated in the figure below.

In the GRS LVLH frame, the Z axis is aligned with the vector from the spacecraft to the planet center (the nadir direction), the Y axis is the negative of the cross product of the position and velocity vectors (into the plane of the paper in the illustration), and the X axis points in the instantaneous direction of motion, completing a right-handed coordinate system.

The spacecraft fixed frame is illustrated in the figure below. The Z axis is along the viewing direction of the instrument deck inside the adapter ring and of the GRS just outside the adapter ring, the Y axis is directed from the spacecraft along the magnetometer boom, and the X-axis is parallel to the solar panel booms, forming a right-handed coordinate system.

The spacecraft attitude is specified by the rotation of the spacecraft fixed frame Z axis in the GRS LVLH frame and a twist angle about the Z axis. The Z axis rotation is given by a nadir angle and an azimuth angle, where the nadir angle is 0 degrees when the spacecraft Z axis points along the + Z LVLH axis and 180 degrees when it points along –Z in the LVLH frame, and the LVLH azimuth angle is measured counterclockwise about the Z LVLH axis from the X LVLH axis. The twist angle is measured positive about the +Z spacecraft axis.

5.4.3 Data Storage Conventions

The data are organized following PDS standards. The CAL_RAW, CAL_AC, CAL_SH, CAL_SH2, ENG, and RDR_SUM data are stored in binary files as floating-point, signed and unsigned integer data in most-significant-first (big-endian) byte order. The CAL_SH3 and CAL_SCR data are stored as ASCII files. The DAPs are stored as jpeg2000 image files. See jp2info.txt in the DOCUMENT directory for additional information on the JP2 data format.

5.5 Data Validation

The GRS CDR/RDR/DAP data products were validated by the GRS Instrument Scientist for science content and for compliance with PDS archive standards.

The GRS CDR/RDR/DAP data products and documentation were submitted to a peer review committee for science review according to PDS policy.

5.6 Software

As PDS-compliant tables, most CDR/RDR data can be read using the PDS-supplied program NASAView and other software designed to read PDS data. However, NASAView will not read GRS engineering files because it does not support a one-label-to-many-files relationship. Since NASAView cannot support the GRS engineering CDRs, the GRS team supplies software to read these files. This software is available from the PDS Geosciences node. (See softinfo.txt in the SOFTWARE directory for details.) NASAView is available at no charge from the PDS website http://pds.nasa.gov. The information in the PDS labels includes complete software-readable descriptions of data file formats, so that users may write custom software to read the products if desired.

Please refer to jp2info.txt located in the DOCUMENT directory for information on software to view the DAP JP2 files.

6 Detailed Data Product Specifications

6.1 Common Elements of Calibrated Data

6.1.1 Handling Errors

Even with data validation procedures applied to the volumes, it is inevitable that errors will be introduced into the archive. A plan is required to handle errors discovered in data volumes that have already been produced.

As errors were discovered, they were reported to the GRS data processing facility. The files were corrected and sent on to the PDS. A text file called “ERRATA.TXT” located in the top level of the data volume was maintained to track and document all discovered errors. The keywords PRODUCT_VERSION_ID and PRODUCT_CREATION_TIME were updated in the PDS labels of corrected files.

6.1.2 Geometric Elements

The timing and spatial information that is packaged with the GRS CDR/RDR/DAP data products are the timing and spatial values derived from the appropriate SPICE kernels collected for each day of the mission. SPICE is an acronym for Spacecraft, Planet, Instrument, C-matrix, and Event kernels. SPICE kernels are provided by the Navigational Ancillary Information Facility (NAIF) at the Jet Propulsion Laboratory, and are the standard for all timing and spatial data transformations.

6.1.3 PDS Label File Format

Below are the keyword definitions for the detached PDS label files:

A_AXIS_RADIUS

Provides the value of the semimajor axis of the ellipsoid that defines the approximate shape of a target body.

B_AXIS_RADIUS

Provides the value of the intermediate axis of the ellipsoid that defines the approximate shape of a target body.

C_AXIS_RADIUS

Provides the value of the semiminor axis of the ellipsoid that defines the approximate shape of a target body.

CENTER_LATITUDE

Provides a reference latitude for certain map projections.

CENTER_LONGITUDE

Provides a reference longitude for certain map projections.

COLUMNS

Identifies the number of columns (fields) in a table.

COORDINATE_SYSTEM_NAME

Provides the full name of the coordinate system to which the state vectors are referenced, in this case "MEAN EARTH/POLAR AXIS OF DE421".

COORDINATE_SYSTEM_TYPE

One of the three basic types of coordinate systems, in this case "BODY-FIXED ROTATING".

DATA_SET_ID

Uniquely identifies the CDR/RDR/DAP file as part of a volume collection, organized by sensor, mission phase, and version number. The GRS CDR/RDR DATA_SET_ID is “MESS-E/V/H-GRNS-3-GRS-CDR-V1.0” and the GRS DAP DATA_SET_ID is “MESS-E/V/H-GRNS-5-GRS-DAP-V1.0”.

^DATA_SET_MAP_PROJECTION

Pointer to the data set map projection catalog file.

DERIVED_MINIMUM

Indicates the smallest value occurring in a given instance of the data object after the application of a scaling factor and/or offset.

DERIVED_MAXIMUM

Indicates the largest value occurring in a given instance of the data object after the application of a scaling factor and/or offset.

DESCRIPTION

Specifies a description of the object.

DETECTOR_ID

The detector_id element identifies a particular instrument detector.

EASTERNMOST_LONGITUDE

For Planetocentric coordinates and for Planetographic coordinates in which longitude increases toward the east, the easternmost (rightmost) longitude of a spatial area (e.g.,a map, mosaic, bin, feature or region)

is the maximum numerical value of longitude unless it crosses the Prime Meridian.

ENCODING_TYPE

Indicates the type of compression or encryption used for data storage.

ENCODING_TYPE_VERSION_NAME

Indicates the version of a standard or specification with which a particular ENCODING_TYPE complies.

FILE_NAME

Provides the location independent name of a file.

FILE_RECORDS

Indicates the number of physical file records in the detached data file.

^IMAGE

Pointer to the image data file.

INSTRUMENT_HOST_NAME

A unique identifier for (name of) the spacecraft on which the instrument is hosted, in this case "MESSENGER".

INSTRUMENT_ID

Unique ID associated with the instrument, in this case "GRS".

INSTRUMENT_NAME

Full, unabbreviated name of the instrument, in this case "GAMMA RAY SPECTROMETER".

INTERCHANGE_FORMAT

Specifies the table format, binary or ASCII.

KEYWORD_LATITUDE_TYPE

Identifies the type of latitude (planetographic or planetocentric) used in the labels, in this case it is planetocentric.

LINE_FIRST_PIXEL

Provides the line index for the first pixel that was physically recorded at the beginning of the image array.

LINE_LAST_PIXEL

Provides the line index for the last pixel that was physically recorded at the end of the image array.

LINE_PROJECTION_OFFSET

Provides the line offset value of the map projection origin position from the line and sample 1,1 (line and sample 1,1 is considered the upper left corner of the digital array).

LINE_SAMPLES

Indicates the total number of data instances along the horizontal axis of an image.

LINES

Indicates the total number of data instances along the vertical axis of an image.

MAP_PROJECTION_ROTATION

Provides the clockwise rotation, in degrees, of the line and sample coordinates with respect to the map projection origin (line_projection_offset, line_projection_offset). This parameter is used to indicate where 'up' is in the projection.

MAP_PROJECTION_TYPE

Identifies the type of projection characteristic of a given map, in this case "SIMPLE CYLINDRICAL".

MAP_RESOLUTION

Identifies the scale of a given map in pixel/degree. The scale is defined as the ratio of the actual distance between two points on the surface of the target body to the distance between the corresponding points on the map. The map_scale references the scale of a map at a certain point or line.

MAP_SCALE

Identifies the scale of a given map in km/pixel. The scale is defined as the ratio of the actual distance between two points on the surface of the target body to the distance between the corresponding points on the map. The map_scale references the scale of a map at a certain point or line.

MAXIMUM_LATITUDE

Specifies the northernmost latitude of a spatial area.

MAXIMUM_LONGITUDE

Specifies the westernmost (left_most) longitude of a spatial area.

MISSION_PHASE_NAME

The name of the mission phase during which data were collected. See the dataset.cat file for a table identifying the mission phases with start and end dates.

MISSING_CONSTANT

Supplies the value used to indicate that no data were available.

NAME

Name of the file or time_series object. This parameter is used in the engineering CDR to specify the engineering parameter name and associated files and time series.

OBJECT=FILE

Specifies that the CDR/RDR is a PDS FILE object. This object contains its own elements; name, record_type, record_bytes, file_records, ^time_series, product_id, product_type, and description. NOTE: The end of the object definition is always marked with an END_OBJECT line.

OBJECT=IMAGE

Specifies that the DAP is a PDS IMAGE object. This object contains its own elements; name, lines, line_samples, sample_type, sample_bits, unit, scaling_factor, derived_minimum, derived_maximum, and missing_constant. NOTE: The end of the object definition is always marked with an END_OBJECT line.

OBJECT=TABLE

Specifies that the CDR/RDR is a PDS TABLE object. This object contains its own elements; columns, interchange_format, rows, row_bytes, description and ^structure. NOTE: The end of the object definition is always marked with an END_OBJECT line.

OBJECT=TIME_SERIES

Specifies that the CDR is a PDS TIME_SERIES object. This object contains its own elements; name, interchange_format, rows, row_bytes, sampling_parameter_name, sampling_parameter_unit, sampleing_parameter_interval, columns and ^structure. NOTE: The end of the object definition is always marked with an END_OBJECT line.

PDS_VERSION_ID

Represents the version number of the PDS standards document that is valid when a data product label is created. PDS3 is used for the MESSENGER data products.

POSITIVE_LONGITUDE_DIRECTION

Identifies the direction of longitude (e.g. EAST, WEST) for a planet, in this case "EAST".

PRODUCER_FULL_NAME

Provides the full_name of the individual mainly responsible for the production of a data set.

PRODUCER_ID

Provides a short name or acronym for the producer or producing team/group of a dataset.

PRODUCER_INSTITUTION_NAME

Identifies a university, research center, NASA center or other institution associated with the production of a data set.

PRODUCT_CREATION_TIME

Stores the time that the data product was created, in UTC time in the format YYYY-MM-DDTHH:MM:SS.

PRODUCT_ID

The product_id data element represents a permanent, unique identifier assigned to a data product by its producer. Note: In the PDS, the value assigned to product_id must be unique within its data set. See section 6 for product naming conventions.

PRODUCT_TYPE

Spectral and engineering data products are identified as a CDR (Calibrated Data Record) , RDR (Reduced Data Record, or DAP (Derived Analysis Product).

PRODUCT_VERSION_ID

The product_version_id element identifies the version of an individual product within a data set. Example: 1.0, 2A, 1.2.3C. Note: This is not the same as the data set version that is an element of the data_set_id value. product_version_id is intended to identify separate iterations of a given product, which also have unique file_names.

RECORD_BYTES

This element indicates the number of bytes in a physical file record, including record terminators and separators.

RECORD_TYPE

This element indicates the record format of a file.

REQUIRED_STORAGE_BYTES

Provides the number of bytes required to store an uncompressed file.

ROWS

Number of rows in the table.

ROW_BYTES

Specifies the number of bytes for each row in the table.

SAMPLE_BITS

Indicates the stored number of bits, or units of binary information, contained in a line_sample value.

SAMPLE_FIRST_PIXEL

Provides the sample index for the first pixel that was physically recorded at the beginning of the image array.

SAMPLE_LAST_PIXEL

Provides the sample index for the last pixel that was physically recorded at the end of the image array.

SAMPLE_PROJECTION_OFFSET

Provides the sample offset value of the map projection origin position from line and sample 1,1 (line and sample 1,1 is considered the upper left corner of the digital array). Note: that the positive direction is to the right and down.

SAMPLE_TYPE

Indicates the data storage representation of sample value.

SAMPLING_PARAMETER_NAME

Identifies the sampling parameter name. In the GRS_ENG data products the sampling parameter is time.

SAMPLING_PARAMETER_UNIT

Identifies the sampling parameter unit. In the GRS_ENG data the sampling parameter unit is seconds.

SAMPLING_PARAMETER_INTERVAL

Identifies the sampling parameter interval, which is undefined for the GRS_ENG.

SCALING_FACTOR

Provides the constant value by which the stored value is multiplied.

SOFTWARE_NAME

Identifies the name of the software system that created the data products.

SOFTWARE_VERSION_ID

Identifies the version of software used to generate the data product.

SPACECRAFT_CLOCK_START_COUNT

Mission elapsed time clock count in seconds of the spacecraft computer at the start of the observation.

SPACECRAFT_CLOCK_STOP_COUNT

Mission elapsed time clock count in seconds of the spacecraft computer at the end of the observation.

STANDARD_DATA_PRODUCT_ID

Used to link a data product (file) to a standard data product (collection of similar files) described within

software interface specification document for a particular data set.

START_TIME

Start time of the observation in UTC in the format YYYY-MM_DDTHH:MM:SS.nnn.

STOP_TIME

Time when the instrument stopped collecting measurements in UTC in the format YYYY-MM_DDTHH:MM:SS.nnn.

^STRUCTURE

Pointer to the external file which provides the structure definition for the table object. In the CDR/RDR data set the structure is found in a *.FMT file named similarly to the data product and located in the LABEL directory.

^TABLE

Pointer to the external data file that contains the table object.

TARGET_NAME

Target of the observation, in this case "MERCURY".

^TIME_SERIES

Pointer to the external file which provides the data for the file object.

UNCOMPRESSED_FILE_NAME

Provides the location independent name of a file. In the case of the .JP2 files in the DAP dataset, this is the name of the .IMG file you would get if you uncompressed the .JP2 file. This .IMG file doesn’t actually exist on the volume.

UNIT

Provides the full name or standard abbreviation of a unit of measurement in which a value is expressed.

WESTERNMOST_LONGITUDE

For Planetocentric coordinates and for Planetographic coordinates in which longitude increases toward the east, the westernmost (leftmost) longitude of a spatial area (e.g.,a map, mosaic, bin, feature or region) is the minimum numerical value of longitude unless it crosses the Prime Meridian this case Mercury.

6.1.4 Table File Formats

Each GRS CDR/RDR PDS label contains a pointer to the column format file. This file describes the structure of the GRS table that includes column name, byte size, data type, applicable units, and a description of the value assigned to the column. See Appendix 8.7 for the format files.

6.1.5 Format File Keyword Definitions

The following describes the keywords used in the format file:

BYTES

Specifies the total number of bytes allocated for this particular column element.

COLUMN_NUMBER

Identifies the location of the column within the larger table data object. For tables consisting of rows (I= 1, N) and columns (j = 1, M), the column_number is the j-th index of any row.

DATA_TYPE

Specifies the internal representation and/or mathematical properties of the value being stored in this column.

FORMAT

A specified or predetermined arrangement of data within a file or on a storage medium. Note: In the PDS, the

format element indicates the display specification for a collection of data. It is equivalent to the FORTRAN

language format specification. Example values: 'Ew.deEXP', A6, I5.

ITEMS

Defines the number of multiple, identical occurrences of a single data item.

ITEM_BYTES

Represents the size in each individual item within the column field.

NAME

Indicates a literal value representing the common term used to identify an element or object.

NOTE: In the PDS data dictionary, name is restricted to 30 characters and must conform to PDS nomenclature standards.

OBJECT=COLUMN

Identifies the object as a column field within a table.

START_BYTE

Identifies the location of the first byte of the particular column, counting from 1.

6.2 Raw Spectra – GRS_CAL_RAW

6.2.1 Data Product Structure and Organization

The GRS_CAL_RAW are raw gamma spectra that have the timing, spatial, and engineering readings taken at the mid-point of the spectral collection period associated with it. This association of spectra with all necessary ancillary data supports calibration of the spectra from a counts per channel regime (EDR and CDR data) to a counts per energy bin regime (RDR data). These spectra have been temperature-corrected; see MESSGRS_PROCESSING.PDF in the DOCUMENT directory for a complete description of the correction process. The GRS_CAL_RAW data product is structured as a time series, 59-column data table. See Appendix 8.7.1 for the GRS_CAL_RAW table structure.

The GRS_CAL_RAW data product is organized as a binary data file containing raw spectra and associated data collected over a 24-hour time period, with a detached ASCII text PDS label file. The 24 hour data files are grouped by Earth day. Data folders are labeled by Earth date in the format YYYY/MM/DD.

6.2.2 Data Format Descriptions

The data format for the GRS_CAL_RAW is a 59-column binary table. Columns vary in width from 1 to 32,768 bytes. Column structure and start byte are described in Appendix 8.7.1. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.2.3 File Naming Conventions

The file names developed for PDS data volumes are restricted to a 36-character file name and a 3 character extension name with a period separating the file and extension names. The general form of the GRS_CAL_RAW file name is:

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

CRA – Raw GRS Spectra with associated engineering, timing and spatial

data.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS CDR data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The binary table file has the extension .DAT.

6.2.4 Label Description

The GRS_CAL_RAW data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of DAT.

PDS labels are written in Object Description Language (ODL). PDS label statements have the form of "keyword = value". Each label statement is terminated with a carriage return character (ASCII 13) and a line feed character (ASCII 10) sequence to allow the label to be read by many operating systems. Pointer statements with the following format are used to indicate the location of data objects:

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.3 Anticoincidence Spectra – GRS_CAL_AC

6.3.1 Data Product Structure and Organization

The GRS_CAL_AC are anticoincidence spectra that have the timing, spatial and engineering readings taken at the mid-point of the spectral collection period associated with it. This association of spectra with all necessary ancillary data supports calibration of the spectra from a counts per channel regime (EDR and CDR data) to a counts per energy bin regime (RDR data). These spectra have been temperature corrected, see MESSGRS_PROCESSING.PDF in the DOCUMENT directory for a complete description of the correction process. The GRS_CAL_AC data product is structured as a time series, 59-column data table. See Appendix 8.7.2 for the GRS_CAL_AC table structure.

The GRS_CAL_AC data product is organized as a binary data file containing corrected spectra and associated data collected over a 24 hour time period, with a detached ASCII text PDS label file . The 24 hour data files are grouped by Earth day. Data folders are labeled by Earth date in the format YYYY/MM/DD.

6.3.2 Data Format Descriptions

The data format for the GRS_CAL_AC is a 59-column binary table. Columns vary in width from 1 to 32,768 bytes. Column structure and start byte are described in Appendix 8.7.2. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.3.3 File Naming Conventions

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

CAC – Anti-coincident GRS Spectra with associated engineering, timing and spatial data.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS CDR data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The binary table file has the extension .DAT.

6.3.4 Label Description

The GRS_CAL_AC data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of DAT.

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.4 Shield Spectra – GRS_CAL_SH

6.4.1 Data Product Structure and Organization

This format for the shield data is used for data acquired before September 17^th 2010. A new version of flight software was loaded which produced a new format (GRS_CAL_SH2). The GRS_CAL_SH are shield spectra that have the timing, spatial and engineering readings taken at the mid-point of the spectral collection period associated with it. This association of spectra with all necessary ancillary data supports calibration of the spectra from a counts per channel regime (EDR and CDR data) to a counts per energy bin regime (RDR data).The GRS_CAL_SH data product is structured as a time series, 35-column data table. See Appendix 8.7.3 for the GRS_CAL_SH table structure.

The GRS_CAL_SH data product is organized as a binary data file containing corrected spectra and associated data collected over a 24 hour time period, with a detached ASCII text PDS label file. The 24 hour data files are grouped by Earth day. Data folders are labeled by Earth date in the format YYYY/MM/DD.

6.4.2 Data Format Descriptions

The data format for the GRS_CAL_SH is a 35-column binary table. Columns vary in width from 1 to 32,768 bytes. Column structure and start byte are described in Appendix 8.7.3. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.4.3 File Naming Conventions

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

CSH – Shield GRS Spectra with associated engineering, timing and spatial data.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS_SH data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The binary table file has the extension .DAT.

6.4.4 Label Description

The GRS_CAL_SH data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of DAT.

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.5 Shield Spectra – GRS_CAL_SH2

6.5.1 Data Product Structure and Organization

This format for the shield data is used for data acquired after September 17^th 2010. A new version of flight software was loaded to produce this new format. The GRS_CAL_SH2 are shield spectra that have the timing, spatial and engineering readings taken at the mid-point of the spectral collection period associated with it. This association of spectra with all necessary ancillary data supports calibration of the spectra from a counts per channel regime (EDR and CDR data) to a counts per energy bin regime (RDR data) .The GRS_CAL_SH2 data product is structured as a time series, 45-column data table. See Appendix 8.7.4 for the GRS_CAL_SH2 table structure.

The GRS_CAL_SH2 data product is organized as a binary data file containing corrected spectra and associated data collected over a 24 hour time period, with a detached ASCII text PDS label file. The 24 hour data files are grouped by Earth day. Data folders are labeled by Earth date in the format YYYY/MM/DD.

6.5.2 Data Format Descriptions

The data format for the GRS_CAL_SH2 is a 45-column binary table. Columns vary in width from 1 to 256 bytes. Column structure and start byte are described in Appendix 8.7.4. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.5.3 File Naming Conventions

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

CS2 – Shield GRS Spectra with associated engineering, timing and spatial data.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS_CAL_SH2 data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The binary table file has the extension .DAT.

6.5.4 Label Description

The GRS_CAL_SH2 data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of DAT.

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.6 Shield Spectra – GRS_CAL_SH3

6.6.1 Data Product Structure and Organization

This format for the shield data is used for data acquired after 17 March 2013. A new version of flight software was loaded to produce this new format. The GRS_CAL_SH3 are shield spectra that have the timing, spatial and engineering readings taken at the mid-point of the spectral collection period associated with it. This association of spectra with all necessary ancillary data supports calibration of the spectra from a counts per channel regime (EDR and CDR data) to a counts per energy bin regime (RDR data). The GRS_CAL_SH3 data product is structured as a time series, 32-column data table. See Appendix 8.7.5 for the GRS_CAL_SH3 table structure.

The GRS_CAL_SH3 data product is organized as an ASCII data file containing corrected spectra and associated data collected over a 24 hour time period, with a detached ASCII text PDS label file. The 24 hour data files are grouped by Earth day. Data folders are labeled by Earth month in the format YYYY/MM.

6.6.2 Data Format Descriptions

The data format for the GRS_CAL_SH3 is a 32-column ASCII table. Column structure and start byte are described in Appendix 8.7.5. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.6.3 File Naming Conventions

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

CS3 – Shield GRS Spectra with associated engineering, timing and spatial data.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS_CAL_SH3 data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The ASCII table file has the extension .TAB.

6.6.4 Label Description

The GRS_CAL_SH3 data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of TAB.

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.7 Shield Spectra – GRS_CAL_SCR

6.7.1 Data Product Structure and Organization

This data product was created following the February 25, 2013 flight software upload. After a commissioning phase, the final product was produced beginning on March 18, 2013. The GRS_CAL_SCR are time series measurements of the total count rate measured by the GRS anti-coincidence shield, and are due to incident particles (primarily electrons, but also gamma-rays, protons, and neutrons). Each data product, which is associated with a given measurement time, is subdivided into 10-ms-cadence measurements of the count rate, which are sequentially assigned to the 16,384 channels in the spectrum array. For short integration periods, this array is not filled and the remaining entries as set to zero. For longer integration periods, the array fills up and the final channel contains the sum of all subsequent events. This typically occurred when the spacecraft was far from Mercury, and therefore the measurements of less interest. These products have the timing, spatial and engineering readings taken at the mid-point of the spectral collection period associated with it. The GRS_CAL_SCR data product is structured as a time series, 32-column data table. See Appendix 8.7.6 for the GRS_CAL_SCR table structure.

The GRS_CAL_SCR data product is organized as an ASCII data file containing corrected spectra and associated data collected over a 24 hour time period, with a detached ASCII text PDS label file. The 24 hour data files are grouped by Earth day. Data folders are labeled by Earth month in the format YYYY/MM.

6.7.2 Data Format Descriptions

The data format for the GRS_CAL_SCR is a 32-column binary table. Column structure and start byte are described in Appendix 8.7.6. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.7.3 File Naming Conventions

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

CSC – Shield GRS Count Rate measurements with associated engineering, timing and spatial data.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS_CAL_SCR data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The ASCII table file has the extension .TAB.

6.7.4 Label Description

The GRS_CAL_SCR data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of TAB.

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.8 Engineering Data – GRS_ENG

6.8.1 Data Product Structure and Organization

The GRS_ENG are time series records for each engineering parameter taken over the course of a day. Data files are grouped in the ENG folder and are labeled with the engineering parameter name. Individual records are a single data collection interval that is variable in duration. Engineering values are reported in individual binary tables by parameter name and include collection time, raw value, and engineering value. Engineering values (physical units) are calculated from the raw DN values using the polynomial coefficients given in Appendix 8.4, which were derived during instrument calibration. In general, temperatures are reported in Celsius (except that HPGe crystal temperatures are reported in Kelvin), currents in amperes, and potentials in volts. GRS_ENG parameters and engineering units are listed in Table 6.1 Engineering Parameter Names and Units.

Table 6.1 Engineering Parameter Names and Units

GRS_ENG Index	GRS_ENG Parameter Name	Engineering Units
01	LVPS_PLUS5V	Volts
02	LVPS_NEG5V	Volts
03	LVPS_PLUS12V	Volts
04	LVPS_NEG12V	Volts
05	LVPS_PLUS5V_I	Amps
06	LVPS_NEG5V_I	Amps
07	LVPS_PLUS12V_I	Amps
08	LVPS_NEG12V_I	Amps
09	LVPS_TEMP	Celsius
10	LVPS_PRI_I	Amps
11	LVPS_SEC_I	Amps
12	HVPS_TEMP	Celsius
13	HVPS_VOLT	Volts
14	HVPS_REF_VOLT	Digital Number
15	HPGE_TEMP_1	Kelvin
16	HPGE_TEMP_2	Kelvin
17	HPGE_DET_LEAK	Pico-amps
18	HVPS_TEMP_2	Celsius
19	PREAMP_TEMP	Celsius
20	SHAPER_TEMP	Celsius
21	AD_TEMP	Celsius
22	HV_MONITOR	Volts
23	REF_2_5V	Counts*
24	REF_2_5V_DIV2	Counts*
25	REF_2_5V_DIV3	Counts*
26	CONTROL_BOARD_TEMP	Celsius
27	ANNEAL_PRI_VOLT	Volts
28	COOLER_PRI_VOLT	Volts
29	ANNEAL_SEC_I	Milliamps
30	COOLER_SEC_I	Milliamps
31	COOLER_PRI_I	Milliamps
32	ANNEAL_PRI_I	Milliamps
33	COOLER_POWER_BOARD_TEMP	Celsius
34	COOLER_TEMP	Celsius
35	CMD_SCIENCE_MODE	Digital Number
36	CMD_HPGE_HV	Volts
37	CMD_SHIELD_HV	Volts
38	CALIB_AVG_DET_TEMP	Kelvin
39	HPGE_HV_SAFING_LVL	Digital Number
40	SHLD_HV_SAFING_LVL	Digital Number
41	COOLER_TEMP_SETPOINT	Kelvin

*ADC digital counts associated with reference voltage (assumed constant), to correct ADC for temperature dependence.

6.8.2 Data Format Descriptions

The data format for the GRS_ENG data are 41 individual binary tables containing 5 data columns. The 5 data columns are structured and labeled identically in all 41 data tables. Columns vary in width from 2 to 23 bytes. Column structure and start byte are described in Appendix 8.7.7. The number of rows in a data table depends on the number of collection intervals during the time frame of the data file (i.e., one Earth day).

6.8.3 File Naming Conventions

Engineering data are contained in a subfolder named GRS ENG with files named according to the following naming convention,

"GRS__ZZZYYYYDDDWWW", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

EXX – Engineering data where XX is the Index.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS Engineering data file.

WWW reserved character string used during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

Each of the 41 individual binary data tables resides in this folder, and is labeled with the appropriate engineering parameter name (e.g. GRS_E022012044ZZZ.DAT).

6.8.4 Label Description

The GRS_ENG data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. For the GRS_ENG data product, a single PDS label describes the 41 binary tables that make up one product. This label is named GRS_ENGYYYYDDD.LBL according to the above scheme.

^object = location

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.9 Summed Spectra – GRS_RDR_SUM

6.9.1 Data Product Structure and Organization

The GRS_RDR_SUM is a reduced data product that is derived from the GRS_CAL_AC and GRS_CAL_RAW. The GRS_RDR_SUM are summed spectra over certain spatial and temporal regions. The GRS_RDR_SUM data product is structured as a, 52-column data table. See Appendix 8.7.8 for the GRS_RDR_SUM table structure. See Appendix 8.6, SUM_TYPE for the different types of sums. Only spectra that are not marked as BAD were used in making sums.

The GRS_RDR_SUM data product is organized as a binary data file containing summed spectra and associated data collected over an Earth year, with a detached ASCII text PDS label file. The files are grouped by Earth year. Data folders are labeled by Earth date, format YYYY/MM/DD.

Summed spectra are limited to data acquired when the angle between the detector boresight and the spacecraft-to-planet-center vectors (hereafter referred to as the nadir angle) was less than 15°. This is because the photopeak detection efficiency of the MESSENGER Gamma-Ray Spectrometer is a function of the energy and the incident angle of the detected gamma rays [Peplowski et al., 2012]. The orientation-dependency is primarily the result of the placement of the GRS on the instrument deck of the spacecraft [Goldsten et al., 2007], which results in attenuation of the planet-originating signal by instrument-surrounding components such as the adapter ring and sunshade [Rhodes et al., 2011]. Attenuation becomes significant for gamma-rays incident at angles larger than 45 degrees, although some attenuation is experienced for angles as small as ~20 degrees. As a result, summed spectra are limited to GRS data acquired at nadir angles of <= 15 degrees, a choice that limits the nadir-angle induced variability in the detection efficiency and facilitates comparison of the summed data products.

References for these issues:

Goldsten, J. O., Rhodes, E. A., Boynton, W. V., Feldman, W. C., Lawrence, D. J., Trombka, J. I., Smith, D. M., Evans, L. G., White, J., Madden, N. W., Berg. P. C., Murphy, G. A., Gurnee, R. S., Strobehn, K., Williams, B. D., Schaefer, E. D., Monaco, C. A., Cork, C. A., Eckels, J. D., Miller, W. O., Burks, M. T., Hagler, L. B., DeTeresa, S. J. and Witte, M. C., (2007), The MESSENGER Gamma-Ray and Neutron Spectrometer, Space Sci. Rev., doi:10.1007/s11214-007-9262-7.

Rhodes, E. A., Evans, L. G. Nittler, L. R., Starr, R. D., Sprague, A. L., Lawrence, D. J., McCoy, T. J., Stockstill-Cahill, K. R., Goldsten, J. O., Peplowski, P. N., Hamara, D. K., Boynton, W. V., and Solomon, S. C., (2011), Analysis of MESSENGER Gamma-Ray Spectrometer data from the Mercury flybys, Planet Space Sci., doi:10.1016/j.pss.2011.07.018.

Peplowski, P.N., Lawrence, D. J., Rhodes, E. A., Sprague, A. L., McCoy, T. J., Denevi, B. W., Evans, L. G., Head, J. W., Nittler, L. R., Solomon, S. C., Stockstill-Cahill, K. R., and Weider, S. Z., (2012), Variations in the abundances of potassium and thorium on the surface of Mercury: Results from the MESSENGER Gamma-Ray Spectrometer, J. Geophys. Res., doi:10.1029/2012JE004141 .

6.9.2 Data Format Descriptions

The data format for the GRS_RDR_SUM is a 52-column binary table. Columns vary in width from 1 to 65,536 bytes. Column structure and start byte are described in Appendix 8.7.8. The number of rows in a data table depends on the spatial area for the type of sum.

6.9.3 File Naming Conventions

"GRS__ZZZYYYYDDDWWW.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ Data product name–

RSS – Reduced spectral sum.

YYYY four-digit year corresponding to the start-time of the first record in the GRS data file.

DDD three-digit day of the year corresponding to the start time of the first record in the GRS_RDR_SUM data file.

WWW reserved character string for use during the course of the mission as necessary to identify “special” data products. Nominal data products are identified by ZZZ.

.XXX the file extension. The binary table file has the extension .DAT.

6.9.4 Label Description

The GRS_RDR_SUM data product has detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of DAT.

^object = location,

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.10Count Rate and Abundance Maps – GRS_DAP

6.10.1 Data Product Structure and Organization

The GRS_DAP is an advanced data product that is derived from calibrated data records in a manner that is similar to the creation of the reduced data records (e.g. GRS_ RDR_SUM). The GRS_DAPs are 720 x 360 pixel maps of gamma-ray count rates or count-rate-derived elemental abundances. Each map pixel corresponds to 0.5° ´ 0.5° surface elements, and range from –180° to 180° longitude and –90° to 90° latitude. The data are mapped in larger surface elements whose size is variable but are typically larger than 15° ´ 15°. The value for each surface element was derived from multiple data records (GRS_CAL_AC) summed using the process described for deriving GRS_RDR_SUM records. Values of zero denote regions that were not mapped by the GRS due to the high orbital altitudes of the spacecraft, which limited the statistical significance of measurements in equatorial and southern latitudes.

The maps were created using multiple GRS_CAL_AC spectra that were summed according to the subspacecraft latitude and longitude and were limited to data acquired when the angle between the detector boresight and the spacecraft-to-planet-center vectors was less than 15°.

There are a total of 8 GRS_DAP maps: a potassium (K) abundance map, silicon (Si), oxygen (O), and K gamma-ray count rate maps, along with 4 maps of the one-standard-deviation statistical significance of these measurements. The maps have spatial coverage that is limited to the northern hemisphere as a result of the highly elliptical orbit of MESSENGER about Mercury (with periapse location at mid-to-high northern latitudes) and the strong altitude-dependence of the GRS measurements. The spatial resolution of the measurements as shown in the maps is variable to ensure comparable statistical significance for each measurement pixel [Peplowski et al., 2012].

The data reduction process used to create these maps is presented in the document MESSGRS_PROCESSING.PDF, located in the DOCUMENT directory.

Reference:

6.10.2 Data Format Descriptions

There are a total of 8 DAP maps: a potassium (K) abundance map, silicon (Si), oxygen (O), and K gamma-ray count rate maps, along with error maps for each. Each GRS_DAP is a 720 ´ 360 jpeg2000 image with a detached ASCII text PDS label. See jp2info.txt in the DOCUMENT directory for additional information on the JP2 data format.

6.10.3 File Naming Conventions

"GRS_ZZZ_Y_WWW_VVV.XXX", where:

GRS instrument identifier: represents the GRS instrument

ZZZ data product name–

DAP – Derived Analysis Product.

Y element name in periodic table: Potassium (K), Silicon (Si), or Oxygen (O).

WWW map type: abundance (ABD) or gamma-ray count rate (GCR).

VVV data map (MAP) or error map (ERR).

.XXX the file extension: jpeg2000 (JP2).

6.10.4 Label Description

The GRS_DAP data products have detached PDS labels stored as ASCII text. A PDS label is object-oriented and describes the objects in the data file. The PDS label contains keywords for product identification and for data object definitions. The label also contains descriptive information needed to interpret or process the data objects in the file. The detached label file has the same name as the data file it describes, except that it has the extension LBL instead of JP2.

^object = location,

where the carat character (^, also called a pointer) is followed by the name of the specific data object. The location is the name of the file that contains the data object.

6.11Archive Volume

Both the GRS CDR/RDR/DAP documentation and data needed to analyze the CDRs, RDRs, and DAPs are stored on a single archive volume. The following documentation is included in the archive:

All required PDS catalog files for the CDR/RDR/DAP archive (dataset, instrument, mission, etc.).
The CDR/RDR/DAP SIS document.

3. A GRS calibration procedures document. This contains appropriate pseudo-code for calibrating the data, converting the time word (MET to UTC), and transforming the data into useful coordinate systems.

Other documents considered useful by the MESSENGER project or MESSENGER team (i.e., “data processing guide”).

The archive volume bears the PDS-assigned volume ID MESSGRS_2001.

The archive volume was delivered to PDS with the first release of GRS CDR/RDR/DAP data products. Subsequent deliveries of the GRS CDR/RDR/DAP productconsisted of volumes containing only new and changed files.

6.12Directory Structure and Contents for GRS Archive Volume

The following illustration shows the directory structure overview for the data volumes. Below the root directory are the LABEL, GEOMETRY, INDEX, DATA, CATALOG, DOCUMENT and SOFTWARE directories. A detailed description of the directory tree is provided in Figure 2. Empty directories are not included on the volume. (Empty directories occur when no data were received for a given orbit or day in which data were expected.) Please note that the day folders (DD) are excluded for data acquired after March 17, 2013.

<ROOT>

______________________________|___________________________________

| | | | | | |

__|_______________________________________________________________

| | | |

_|______________________________________________

| | |

<01> <02> <12>

____|___________________________________

| | |

<01> <02> <31>

| | |

<GRS_ENG> <GRS_ENG> <GRS_ENG>

Figure 2 Directory Structure Overview for GRS CDR/RDR/DAP Archive Volume

6.12.1 Directory Contents

<ROOT> Directory

AAREADME.TXT - General information file. Provides users with information about the MESSENGER GRS CDR/RDR/DAP data products.

VOLDESC.CAT - PDS file containing labels that describe the volume data products. Information includes: production date, producer name and institution, volume ID, etc.

ERRATA.TXT - Text file for tracking and recording discovered errors in the MESSENGER GRS CDR/RDR/DAP data products.

<DATA> Directory

This is the top level of the directories containing CDRs, RDRs, and DAPs.

<DATA/MAPS> Directory
A sub-directory of the <DATA> directory containing the DAPs.

<DATA/YYYY> Directory

A sub-directory of the <DATA> directory for each year.

<DATA/YYYY/MM> Directory

A sub-directory of the <DATA/YYYY> directory for each month of the year where MM ranges from 01 through 12. Data acquired after March 17, 2013 (GRS_CAL_SH3, GRS_CAL_SCR) are included in the MM directories. Data acquired prior to this date reside in the DD directories (see below).

<DATA/YYYY/MM/DD> Directories

Sub-directories of a <DATA/YYYY/MM> directory, these are the top level directories for the CDR and RDR data products. The names of the data directories identify day of the month for the start time of the data products contained in the directories. Please note that the day folders (DD) are excluded for data acquired after March 17, 2013.

<DATA/YYYY/MM/DD/GRS_ENG> Directories

Sub-directories of a <DATA/YYYY/MM/DD > directory, these are the top level directories for the CDR engineering data products.

<GEOMETRY> Directory

GEOMINFO.TXT - Description of geometry directory files. See section 6.1.

<INDEX> Directory

INDXINFO.TXT - Text file describing contents of <INDEX> directory.

INDEX.TAB - The CDR/RDR/DAP index file is organized as a table. In the table, there is a row for each data product on the volume. The table columns contain parameters that describe the observation and instrument and spacecraft parameters.

The following columns, at minimum, are present in the index table:

VOLUME_ID	MISSION_PHASE_NAME
PATH_NAME	TARGET_NAME
FILE_NAME	START_TIME
PRODUCT_ID	STOP_TIME
PRODUCT_TYPE	START_MET_PARTITION
PRODUCT_CREATION_TIME	SPACECRAFT_CLOCK_START_COUNT
PRODUCT_VERSION_ID	SPACECRAFT_CLOCK_STOP_COUNT
RELEASE_ID

INDEX.LBL - Detached PDS label for INDEX.TAB. It contains the INDEX_TABLE object which identifies and describes the columns of the GRS CDR/RDR/DAP index table. See appendix 8.5.8.

MD5.TAB - List of md5 sums for the archive volume.

MD5.LBL - Detached PDS label for MD5.TAB.

< LABEL > Directory

LABINFO.TXT - Description of label directory files that include additional PDS labels and files that are not packaged with the data products.

<CATALOG> Directory

CATINFO.TXT - Description of catalog directory files.

*.CAT - Description of PDS catalog mission, spacecraft, instrument and data sets as ASCII text files in PDS-specified formats, to be entered into the PDS online catalog for searching.

<DOCUMENT> Directory

The documentation files exist in several forms in order to facilitate access to the documents:

Extension 'TXT' or 'ASC' - ASCII text files (that virtually all text editors can read).

Extension 'PDF' - Adobe Portable Document File.

Extension ‘HTM’ - Hypertext Markup files, which are read in a web browser.

<SOFTWARE> Directory

SOFTINFO.TXT - Description of software directory files. Software files are to view data products.

6.12.2 Data Product Sizes

The following table shows sizes in bytes of each data product and total estimated size of the GRS CDR/RDR/DAP data set.

Table 6.2. Data Product Sizes

Product Type	Time span covered	Typical product size (bytes)	Estimated mission total
GRS_CAL_RAW	1 Earth day	19500000	14000000000
GRS_CAL_AC	1 Earth day	19500000	14000000000
GRS_CAL_SH / SH2	1 Earth day	370000	270000000
GRS_CAL_SH3	1 Earth day	20926913	17500000000
GRS_CAL_SCR	1 Earth day	164236	120000000
GRS_ENG	1 Earth day	68000	2100000000
GRS_RDR_SUM	04 Mar 2011 to 11 Oct 2011	28416000	56832000
GRS_DAP	04 Mar 2011 to 11 Oct 2011	5000	40000

7 Product Delivery

7.1 Product Delivery Mechanism

The GRS CDR and RDR components of the archive volume were delivered separately to ACT in files created with gzip and tar. These files were delivered on a periodic basis to ACT. ACT extracted the volume contents from the delivered files and created the index files. The initial delivery had a PRODUCT_VERSION_ID of 1.0 and a SOFTWARE_VERSION_ID of 1.0.

The GRS DAP components of the archive volume were delivered by APL to ACT. ACT created the DAP labels and index file.

7.2 Product Redelivery

The products were redelivered to ACT when a previously delivered product has changed. Reasons for redelivery included:

· The software that converts the EDRs into CDRs changed. This resulted in a change to the data delivered. The PRODUCT_VERSION_ID and the SOFTWARE_VERSION_ID were incremented by 1 in the .LBL files of the redelivered product.

· The data in the BAD_DATA_FLAG column in a GRS_CACYYYYDDDZZZ.DAT, GRS_CRAYYYYDDDZZZ.DAT or GRS_CSHYYYYDDDZZZ.DAT changed. The PRODUCT_VERSION_ID was incremented by 1 in the .LBL files of the redelivered product.

· GRS_CDR-RDR-DAP_SIS document changed.

· MESSGRS_PROCESSING document changed.

8 Appendices

8.1 Appendix: SPICE Kernel Files Used in MESSENGER Data Products

The following SPICE files were used to compute the UTC time and any geometric quantities found in the PDS labels. Kernel files were generated throughout the mission with a filenaming convention specified by the MESSENGER project.

*.bsp:

MESSENGER spacecraft ephemeris file

*.bc:

MESSENGER spacecraft orientation file.

*.tsc:

MESSENGER spacecraft clock coefficients file.

*.tpc:

Planetary constants file.

*.tls

NAIF leapseconds kernel file, used for converting between Universal Time Coordinated (UTC) and Barycentric Dynamical Time (TDB, also called Ephemeris Time, or ET).

8.2 Appendix: CODMAC/NASA Definition of Processing Levels

Table 8.1. CODMAC/NASA Definition of Processing Levels for Science Data Sets

CODMAC Level	Proc. Type	Data Processing Level Description
1	Raw Data	Telemetry data stream as received at the ground station, with science and engineering data embedded. Corresponds to NASA packet data.
2	Edited Data	Instrument science data (e.g. raw voltages, counts) at full resolution, time ordered, with duplicates and transmission errors removed. Referred to in the MESSENGER program as Experimental Data Records (EDRs). Corresponds to NASA Level 0 data.
3	Calibrated Data	Edited data that are still in units produced by instrument, but have been transformed (e.g. calibrated, rearranged) in a reversible manner and packaged with needed ancillary and auxiliary data (e.g. radiances with calibration equations applied). Referred to in the MESSENGER Program as Calibrated Data Records (CDRs). In some cases, these also qualify as derived data products (DDRs). Corresponds to NASA Level 1A.
4	Resampled data	Irreversibly transformed (e.g. resampled, remapped, calibrated) values of the instrument measurements (e.g. radiances, magnetic field strength). Referred to in the MESSENGER program as either derived data products (DDPs) or derived analysis products (DAPs). Corresponds to NASA Level 1B.
5	Derived Data	Derived results such as maps, reports, graphics, etc. Corresponds to NASA Levels 2 through 5
6	Ancillary Data	Non-Science data needed to generate calibrated or resampled data sets. Consists of instrument gains, offsets, pointing information for scan platforms, etc.
7	Corrective Data	Other science data needed to interpret space-borne data sets. May include ground based data observations, such as soil type or ocean buoy wind drift measurements.
8	User Description	Description of why the data were required, any peculiarities associated with the data sets and enough documentation to allow the secondary user to extract information from the data.

The above is based on the National Research Council Committee on Data Management and Computation (CODMAC) data levels.

8.3 Appendix: GRS Glossary and Acronym List

ACT Applied Coherent Technology Corporation

AGC Automatic Gain Control

AIAA American Institute of Aeronautics and Astronautics

AM Atmosphere and Magnetosphere Group

APL The Johns Hopkins University Applied Physics Laboratory

ASCII American Standard Code for Information Interchange

ATDF Archival Tracking Data File

B-frame Body Frame

C&DH Command and Data Handler

CA Closest Approach

CAS Canned Activity sequence

CCD Charged-Coupled Device

CCSDS Consultative Committee for Space Data Systems

CDF Common Data Format

CFDP CCSDS File Delivery Protocol

CK Camera Kernel (SPICE)

CLCW Command Link Control Word

CLTU Command Link Transfer Unit

CoDMAC Committee on Data Management and Computation

Co-I Co-Investigator

COP Command Operation Procedure

CUCC CSDS Unsegmented Time Code

DAP Derived Analysis Product

DPU Data Processing Unit

EDR Experimental Data Records

EK Event Kernel

EPPS Energetic Particle and Plasma Spectrometer

ET Ephemeris Time

FIPS Fast Imaging Plasma Spectrometer

FITS Flexible Image Transport System

FOP Frame Operation Procedure

FOV Field-of-View

FPA Focal Plane Assembly

FTP File Transfer protocol

GC Geochemistry Group

GP Geophysics Group

GRNS Gamma-ray and Neutron Spectrometer

GRS Gamma Ray Spectrometer

GSFC Goddard Space Flight Center

I&T Integration and Test

I2C Inter-Integrated Circuit

IEM Integrated Electronic Module

IK Instrument Measurement Kernel (SPICE)

IMU Inertial Measurement unit

ISI Integral Systems Incorporated (EPOCH)

LSK Leapseconds Kernel (SPICE)

MAG Magnetometer

MASCS Mercury Atmospheric and Surface Composition Spectrometer

MCP Monitor and Control Processor (DSN station)

MDIS Mercury Dual Imaging System

MESSENGER Mercury, Surface, Space ENvironment, GEochemistry, and Ranging

MET Mission Elapsed Time

MIA Monitor Interface Assembly (DSN station)

NAIF Navigation and Ancillary Information Facility

NSSDC National Space Science Data Center

ODF Orbit Data File

ODL Object Description Language

OWLT One-Way Light Time

PCK Planetary Constant Kernel (SPICE)

PDR Preliminary Design Review

PDR Packetized Data Records

PDS Planetary Data System

SCET Space Craft Event Time

SCLK Space Clock Kernel (SPICE)

SCPS Space Communication Protocol Standards

SFDU Standard Formatted Data Unit

SPICE Spacecraft, Planet, Instrument, C-matrix Events

SPK Spacecraft and Planets Kernel (SPICE)

TDB Barycentric Dynamical Time, the same an ET in the SPICE system

TDT Terrestrial Dynamical Time

TMOD Telecommunications and Mission Operations Directorate

USN Universal Space Net

UTC Coordinated Universal Time

VC Virtual Channel

XRS X-Ray Spectrometer

CDR Index	NAME	DESCRIPTION	Units	Optional Ref Column	Polynomial Coefficients (highest order term first)
1	LVPS_PLUS5V	LVPS +5 volt monitor	V		0	0	0	0	0	0.002479	0
2	LVPS_NEG5V	LVPS -5 volt monitor	V		0	0	0	0	0	0.002479	0
3	LVPS_PLUS12V	LVPS +12 volt monitor	V		0	0	0	0	0	0.002479	0
4	LVPS_NEG12V	LVPS -12 volt monitor	V		0	0	0	0	0	0.002479	0
5	LVPS_PLUS5V_I	LVPS +5V current	A		0	0	0	0	0	0.000244	0
6	LVPS_NEG5V_I	LVPS -5V current	A		0	0	0	0	0	0.000244	0
7	LVPS_PLUS12V_I	LVPS +12V current	A		0	0	0	0	0	0.000244	0
8	LVPS_NEG12V_I	LVPS -12V current	A		0	0	0	0	0	0.000244	0
9	LVPS_TEMP	LVPS Temperature	ºC		0	0	0	1.1254E-10	3.5855E-07	0.012218	-38.889
10	LVPS_PRI_I	LVPS Primary Current	A		0	0	0	0	0	0.000244	0
11	LVPS_SEC_I	LVPS Switched Primary Current (Op Heater)	A		0	0	0	0	0	0.000244	-0.0173
12	HVPS_TEMP*	Shield HVPS Temperature	ºC	14	0	0	0	0	0	0.03372	-277.3
13	HVPS_VOLT*	Shield HVPS Voltage	V	14	0	0	0	0	0	0.032050597	0
14	HVPS_REF_VOLT	Shield HVPS Reference Voltage, nom value = 46852	DN		0	0	0	0	0	1	0
15	HPGE_TEMP_1*	ADC0 Channel 0, HPGE Detector Temperature 1	K	23	-6.01731E-23	1.94306E-17	-2.61457E-12	1.87671E-07	-0.007579695	163.3708647	-1468809.947
16	HPGE_TEMP_2*	ADC0 Channel 1, HPGE Detector Temperature 2	K	23	-6.01731E-23	1.94306E-17	-2.61457E-12	1.87671E-07	-0.007579695	163.3708647	-1468809.947
17	HPGE_DET_LEAK*	ADC0 Channel 2, HPGE Detector Leakage current	pA	23	0	0	0	0	0	0.91618	-19341.47598
18	HVPS_TEMP_2*	ADC0 Channel 3, HPGE HVPS Temperature	ºC	23	-2.8067E-25	3.1611E-20	-1.3066E-15	2.052E-11	6.2608E-08	-7.6038E-03	1.2109E+02
19	PREAMP_TEMP*	ADC0 Channel 4, Pre Amp Temperature	ºC	23	-2.8067E-25	3.1611E-20	-1.3066E-15	2.052E-11	6.2608E-08	-7.6038E-03	1.2109E+02
20	SHAPER_TEMP*	ADC0 Channel 5, Shaper Temperature	ºC	23	-2.8067E-25	3.1611E-20	-1.3066E-15	2.052E-11	6.2608E-08	-7.6038E-03	1.2109E+02
21	AD_TEMP*	ADC0 Channel 6, AD Temperature	ºC	23	-2.8067E-25	3.1611E-20	-1.3066E-15	2.052E-11	6.2608E-08	-7.6038E-03	1.2109E+02
22	HV_MONITOR*	ADC0 Channel 7, HPGE HV Monitor	V	23	0	0	0	0	0	0.06387	0
23	REF_2_5V	ADC0 Channel 8, 2.5V reference, nom value=43059	DN		0	0	0	0	0	1	0
24	REF_2_5V_DIV2	ADC0 Channel 9, 2.5V reference divided by 2	DN		0	0	0	0	0	1	0
25	REF_2_5V_DIV3	ADC0 Channel A, 2.5V reference divided by 3	DN		0	0	0	0	0	1	0
26	CONTROL_BOARD_TEMP	ADC0 Channel B, Controller Board temperature	ºC		0	-6.7391E-21	7.7051E-16	-3.6142E-11	8.771E-07	-0.013407	137.01
27	ANNEAL_PRI_VOLT	ADC1 Channel 0, Anneal +12V monitor	V		0	0	0	0	0	0.0004392	-0.0051
28	COOLER_PRI_VOLT	ADC1 Channel 1, Cooler +15V monitor	V		0	0	0	0	0	0.0004392	-0.0002
29	ANNEAL_SEC_I	ADC1 Channel 2, Anneal +12V current	mA		0	0	0	0	0	0.04611	-0.5
30	COOLER_SEC_I	ADC1 Channel 3, Cooler +15V current	mA		0	0	0	0	0	0.04562	0.8
31	COOLER_PRI_I	ADC1 Channel 4, Cooler primary current	mA		0	0	0	0	0	0.04627	-12
32	ANNEAL_PRI_I	ADC1 Channel 5, Anneal primary current	mA		0	0	0	0	0	0.04545	7
33	COOLER_POWER_BOARD_TEMP	ADC1 Channel 6, Cooler power board temperature	ºC		0	-6.7391E-21	7.7051E-16	-3.6142E-11	8.771E-07	-0.013407	137.01
34	COOLER_TEMP	ADC1 Channel 7, Cooler Stator temperature	ºC		0	0	0	0	2.3554E-06	0.04321	-238.87
35	CMD_SCIENCE_MODE	Commanded to event classification	DN		0	0	0	0	0	1	0
36	CMD_HPGE_HV	Commanded HPGe HV level	V		0	0	0	0	0	1.220703125	0
37	CMD_SHIELD_HV	Commanded Shield HV level	V		0	0	0	0	0	0.732421875	0
38	CALIB_AVG_DET_TEMP	Calibrated, averaged detector temperature	K		-6.01731E-23	1.94306E-17	-2.61457E-12	1.87671E-07	-0.007579695	163.3708647	-1468809.947
39	HPGE_HV_SAFING_LVL	Current safing level	DN		0	0	0	0	0	1	0
40	SHLD_HV_SAFING_LVL	Current safing level	DN		0	0	0	0	0	1	0
41	COOLER_TEMP_SETPOINT	Cooler temperature set point	K		-6.01731E-23	1.94306E-17	-2.61457E-12	1.87671E-07	-0.007579695	163.3708647	-1468809.947

***********	*Enhanced correction using on-board voltage reference values
Column(s)	Correction Formula		Description
12	raw' = 46852*raw(12)/raw(14)	Pre-correct using Column 14, then apply polynomial
13	value = 1500*raw(13)/raw(14)	Direct value, polynomial not req'd
15-16	raw' = 65535-43059*(65535-raw(n))/raw(23)	Bit-wise invert, correct using Column 23, reinvert, then apply polynomial
17-22	raw' = 43059*raw(n)/raw(23)	Pre-correct using Column 23, then apply polynomial

8.5 Appendix: GRS PDS Label Files

8.5.1 GRS_CAL_RAW

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 296

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 65831

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_CRA2011315ZZZ_DAT"

PRODUCT_VERSION_ID = "4.0"

PRODUCT_CREATION_TIME = 2015-09-21T15:04:03

PRODUCT_TYPE = "CDR"

SOFTWARE_NAME = "GRS_CDR_GEN"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DETECTOR_ID = "HPGE"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY ORBIT"

TARGET_NAME = "MERCURY"

START_TIME = 2011-11-11T00:10:29.380

STOP_TIME = 2011-11-11T23:50:23.381

SPACECRAFT_CLOCK_START_COUNT = "1/229457696"

SPACECRAFT_CLOCK_STOP_COUNT = "1/229542890"

^TABLE = "GRS_CRA2011315ZZZ.DAT"

OBJECT = TABLE

COLUMNS = 59

INTERCHANGE_FORMAT = BINARY

ROWS = 296

ROW_BYTES = 65831

DESCRIPTION = "

This table contains one set of corrected raw spectra collected from the

high purity Germanium (HPGe) detector plus spatial and temporal

information and relevant engineering and counter and pulser data

from the time the spectra was taken. A set is defined as all data

with timestamps corresponding to a given day of year.

^STRUCTURE = "GRS_CAL_RAW.FMT"

END_OBJECT = TABLE

END

8.5.2 GRS_CAL_AC

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 296

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 65831

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_CAC2011315ZZZ_DAT"

PRODUCT_VERSION_ID = "4.0"

PRODUCT_CREATION_TIME = 2015-09-21T15:03:58

PRODUCT_TYPE = "CDR"

SOFTWARE_NAME = "GRS_CDR_GEN"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DETECTOR_ID = "HPGE"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY ORBIT"

TARGET_NAME = "MERCURY"

START_TIME = 2011-11-11T00:10:29.380

STOP_TIME = 2011-11-11T23:50:23.381

SPACECRAFT_CLOCK_START_COUNT = "1/229457696"

SPACECRAFT_CLOCK_STOP_COUNT = "1/229542890"

^TABLE = "GRS_CAC2011315ZZZ.DAT"

OBJECT = TABLE

COLUMNS = 59

INTERCHANGE_FORMAT = BINARY

ROWS = 296

ROW_BYTES = 65831

DESCRIPTION ="

This table contains one set of Anti-Coincident (AC) spectra

collected from the high purity Germanium (HPGe) detector plus

spatial and temporal information and relevant engineering and

counter and pulser data from the time the spectra was taken.

A set is defined as all data with timestamps corresponding to

a given day of year.

^STRUCTURE = "GRS_CAL_AC.FMT"

END_OBJECT = TABLE

END

8.5.3 GRS_CAL_SH

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 200

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 4301

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_CSH2004316ZZZ_DAT"

PRODUCT_VERSION_ID = "4.0"

PRODUCT_CREATION_TIME = 2015-09-21T14:03:32

PRODUCT_TYPE = "CDR"

SOFTWARE_NAME = "GRS_CDR_GEN"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DETECTOR_ID = "SHIELD"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "EARTH CRUISE"

TARGET_NAME = "CALIBRATION"

START_TIME = 2004-11-11T01:27:27.344

STOP_TIME = 2004-11-11T23:49:27.939

SPACECRAFT_CLOCK_START_COUNT = "1/8623641"

SPACECRAFT_CLOCK_STOP_COUNT = "1/8704161"

^TABLE = "GRS_CSH2004316ZZZ.DAT"

OBJECT = TABLE

COLUMNS = 35

INTERCHANGE_FORMAT = BINARY

ROWS = 200

ROW_BYTES = 4301

DESCRIPTION ="

This table contains one set of Shield (SHI) spectra

collected from the high purity Germanium (HPGe) detector plus

spatial and temporal information and relevant engineering and

counter and pulser data from the time the spectra was taken.

A set is defined as all data with time stamps corresponding to

a given day of year.

^STRUCTURE = "GRS_CAL_SH.FMT"

END_OBJECT = TABLE

END

8.5.4 GRS_CAL_SH2

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 37

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 1245

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_CS22010260ZZZ_DAT"

PRODUCT_VERSION_ID = "3.0"

PRODUCT_CREATION_TIME = 2015-09-21T14:15:32

PRODUCT_TYPE = "CDR"

SOFTWARE_NAME = "GRS_CDR_GEN"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DETECTOR_ID = "SHIELD"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY 4 CRUISE"

TARGET_NAME = "CALIBRATION"

START_TIME = 2010-09-17T20:55:35.892

STOP_TIME = 2010-09-17T23:55:35.892

SPACECRAFT_CLOCK_START_COUNT = "1/193244409"

SPACECRAFT_CLOCK_STOP_COUNT = "1/193255209"

^TABLE = "GRS_CS22010260ZZZ.DAT"

OBJECT = TABLE

COLUMNS = 45

INTERCHANGE_FORMAT = BINARY

ROWS = 37

ROW_BYTES = 1245

DESCRIPTION ="

This table contains one set of Shield (SHI) spectra

collected from the high purity Germanium (HPGe) detector plus

spatial and temporal information and relevant engineering and

counter and pulser data from the time the spectra was taken.

A set is defined as all data with time stamps corresponding to

a given day of year.

^STRUCTURE = "GRS_CAL_SH2.FMT"

END_OBJECT = TABLE

END

8.5.5 GRS_CAL_SH3

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 1972

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 6547

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_CS32013100ZZZ_TAB"

PRODUCT_VERSION_ID = "4.0"

PRODUCT_CREATION_TIME = 2015-10-22T15:39:28

PRODUCT_TYPE = "CDR"

STANDARD_DATA_PRODUCT_ID = "GRS_CAL_SH3"

SOFTWARE_NAME = "GRSEDR2CDR"

SOFTWARE_VERSION_ID = "3.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DETECTOR_ID = "SHIELD"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY ORBIT YEAR 3"

TARGET_NAME = "MERCURY"

START_TIME = 2013-04-10T00:00:10

STOP_TIME = 2013-04-10T23:59:45

SPACECRAFT_CLOCK_START_COUNT = "2/7876010"

SPACECRAFT_CLOCK_STOP_COUNT = "2/7962385"

^TABLE = "GRS_CS32013100ZZZ.TAB"

OBJECT = TABLE

COLUMNS = 32

INTERCHANGE_FORMAT = ASCII

ROWS = 1972

ROW_BYTES = 6547

DESCRIPTION = "

This table contains one set of calibrated shield spectra from the SHIELD

detector, MESSENGER Gamma Ray Spectrometer (GRS). A set is defined as

all data with MET timestamps corresponding to a given Earth day. The

complete column definitions are contained in an external file found in

the LABEL directory of the archive volume. Additional details are

contained in the CDR-RDR-DAP SIS document.

^STRUCTURE = "GRS_CAL_SH3.FMT"

END_OBJECT = TABLE

END

8.5.6 GRS_CAL_SCR

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 1972

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 98707

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_CSC2013100ZZZ_TAB"

PRODUCT_VERSION_ID = "4.0"

PRODUCT_CREATION_TIME = 2015-10-21T14:17:13

PRODUCT_TYPE = "CDR"

STANDARD_DATA_PRODUCT_ID = "GRS_CAL_SCR"

SOFTWARE_NAME = "GRSEDR2CDR"

SOFTWARE_VERSION_ID = "3.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DETECTOR_ID = "ACS"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY ORBIT YEAR 3"

TARGET_NAME = "MERCURY"

START_TIME = 2013-04-10T00:00:10

STOP_TIME = 2013-04-10T23:59:45

SPACECRAFT_CLOCK_START_COUNT = "2/7876010"

SPACECRAFT_CLOCK_STOP_COUNT = "2/7962385"

^TABLE = "GRS_CSC2013100ZZZ.TAB"

OBJECT = TABLE

COLUMNS = 32

INTERCHANGE_FORMAT = ASCII

ROWS = 1972

ROW_BYTES = 98707

DESCRIPTION = "

This table contains one set of calibrated high-time-resolution count

rate measurements in the GRS anti-coincidence shield. Each entry

contains an array that is populated with values corresponding to the

total number of events registered by the GRS Anti-Coincidence Shield

(ACS) in 10-ms-long increments. When the accumulation period is

insufficient to populate all 16384 channels, the remaining entries are

assigned values of zero. For arrays exceeding 16384 entries in length,

the final channel records the sum of all subsequent entries. A set is

defined as all data with MET timestamps corresponding to a given day.

The complete column definitions are contained in an external file found

in the LABEL directory of the archive volume. Additional details are

contained in the CDR-RDR-DAP SIS document."

^STRUCTURE = "GRS_CAL_SCR.FMT"

END_OBJECT = TABLE

END

8.5.7 GRS_ENG

PDS_VERSION_ID = "PDS3"

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_VERSION_ID = "2.0"

PRODUCT_CREATION_TIME = 2011-08-11T15:16:45

STANDARD_DATA_PRODUCT_ID = "GRS_ENG2008015"

SOFTWARE_NAME = "GRS_CDR_GEN"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY 1 FLYBY"

TARGET_NAME = "MERCURY"

START_TIME = 2008-01-15T00:00:13.096

STOP_TIME = 2008-01-15T23:59:56.098

SPACECRAFT_CLOCK_START_COUNT = "108842594"

SPACECRAFT_CLOCK_STOP_COUNT = "108928977"

/* The complete column definitions are contained in an external */

/* file found in the LABEL directory of the archive disk. */

OBJECT = E01_FILE

/* FILE CHARACTERISTICS */

FILE_NAME = "GRS_E012008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E012008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_PLUS5V_2008015"

PRODUCT_TYPE = "LVPS_PLUS5V"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_PLUS5V voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E01_TIME_SERIES

NAME = LVPS_PLUS5V

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E01_TIME_SERIES

END_OBJECT = E01_FILE

OBJECT = E02_FILE

FILE_NAME = "GRS_E022008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E022008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_NEG5V_2008015"

PRODUCT_TYPE = "LVPS_NEG5V"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_NEG5V voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E02_TIME_SERIES

NAME = LVPS_NEG5V

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E02_TIME_SERIES

END_OBJECT = E02_FILE

OBJECT = E03_FILE

FILE_NAME = "GRS_E032008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E032008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_PLUS12V_2008015"

PRODUCT_TYPE = "LVPS_PLUS12V"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_PLUS12V voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E03_TIME_SERIES

NAME = LVPS_PLUS12V

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E03_TIME_SERIES

END_OBJECT = E03_FILE

OBJECT = E04_FILE

FILE_NAME = "GRS_E042008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E042008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_NEG12V_2008015"

PRODUCT_TYPE = "LVPS_NEG12V"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_NEG12V voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E04_TIME_SERIES

NAME = LVPS_NEG12V

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E04_TIME_SERIES

END_OBJECT = E04_FILE

OBJECT = E05_FILE

FILE_NAME = "GRS_E052008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E052008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_PLUS5V_I_2008015"

PRODUCT_TYPE = "LVPS_PLUS5V_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_PLUS5V_I current, in Amps."

/* DATA OBJECT DEFINITION */

OBJECT = E05_TIME_SERIES

NAME = LVPS_PLUS5V_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E05_TIME_SERIES

END_OBJECT = E05_FILE

OBJECT = E06_FILE

FILE_NAME = "GRS_E062008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E062008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_NEG5V_I_2008015"

PRODUCT_TYPE = "LVPS_NEG5V_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_NEG5V_I current, in Amps."

/* DATA OBJECT DEFINITION */

OBJECT = E06_TIME_SERIES

NAME = LVPS_NEG5V_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E06_TIME_SERIES

END_OBJECT = E06_FILE

OBJECT = E07_FILE

FILE_NAME = "GRS_E072008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E072008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_PLUS12V_I_2008015"

PRODUCT_TYPE = "LVPS_PLUS12V_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_PLUS12V_I current, in Amps."

/* DATA OBJECT DEFINITION */

OBJECT = E07_TIME_SERIES

NAME = LVPS_PLUS12V_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E07_TIME_SERIES

END_OBJECT = E07_FILE

OBJECT = E08_FILE

FILE_NAME = "GRS_E082008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E082008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_NEG12V_I_2008015"

PRODUCT_TYPE = "LVPS_NEG12V_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_NEG12V_I current, in Amps."

/* DATA OBJECT DEFINITION */

OBJECT = E08_TIME_SERIES

NAME = LVPS_NEG12V_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E08_TIME_SERIES

END_OBJECT = E08_FILE

OBJECT = E09_FILE

FILE_NAME = "GRS_E092008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E092008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_TEMP_2008015"

PRODUCT_TYPE = "LVPS_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_TEMP temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E09_TIME_SERIES

NAME = LVPS_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E09_TIME_SERIES

END_OBJECT = E09_FILE

OBJECT = E10_FILE

FILE_NAME = "GRS_E102008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E102008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_PRI_I_2008015"

PRODUCT_TYPE = "LVPS_PRI_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_PRI_I current, in Amps."

/* DATA OBJECT DEFINITION */

OBJECT = E10_TIME_SERIES

NAME = LVPS_PRI_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E10_TIME_SERIES

END_OBJECT = E10_FILE

OBJECT = E11_FILE

FILE_NAME = "GRS_E112008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E112008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "LVPS_SEC_I_2008015"

PRODUCT_TYPE = "LVPS_SEC_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "LVPS_SEC_I current, in Amps."

/* DATA OBJECT DEFINITION */

OBJECT = E11_TIME_SERIES

NAME = LVPS_SEC_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E11_TIME_SERIES

END_OBJECT = E11_FILE

OBJECT = E12_FILE

FILE_NAME = "GRS_E122008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E122008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HVPS_TEMP_2008015"

PRODUCT_TYPE = "HVPS_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HVPS_TEMP temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E12_TIME_SERIES

NAME = HVPS_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E12_TIME_SERIES

END_OBJECT = E12_FILE

OBJECT = E13_FILE

FILE_NAME = "GRS_E132008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E132008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HVPS_VOLT_2008015"

PRODUCT_TYPE = "HVPS_VOLT"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HVPS_VOLT voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E13_TIME_SERIES

NAME = HVPS_VOLT

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E13_TIME_SERIES

END_OBJECT = E13_FILE

OBJECT = E14_FILE

FILE_NAME = "GRS_E142008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E142008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HVPS_REF_VOLT_2008015"

PRODUCT_TYPE = "HVPS_REF_VOLT"

/* DESCRIPTIVE data elements */

DESCRIPTION =

"HVPS_REF_VOLT current reference, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E14_TIME_SERIES

NAME = HVPS_REF_VOLT

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E14_TIME_SERIES

END_OBJECT = E14_FILE

OBJECT = E15_FILE

FILE_NAME = "GRS_E152008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E152008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HPGE_TEMP_1_2008015"

PRODUCT_TYPE = "HPGE_TEMP_1"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HPGE_TEMP_1 temperature, in Kelvin."

/* DATA OBJECT DEFINITION */

OBJECT = E15_TIME_SERIES

NAME = HPGE_TEMP_1

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E15_TIME_SERIES

END_OBJECT = E15_FILE

OBJECT = E16_FILE

FILE_NAME = "GRS_E162008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E162008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HPGE_TEMP_2_2008015"

PRODUCT_TYPE = "HPGE_TEMP_2"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HPGE_TEMP_2 temperature, in Kelvin."

/* DATA OBJECT DEFINITION */

OBJECT = E16_TIME_SERIES

NAME = HPGE_TEMP_2

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E16_TIME_SERIES

END_OBJECT = E16_FILE

OBJECT = E17_FILE

FILE_NAME = "GRS_E172008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E172008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HPGE_DET_LEAK_2008015"

PRODUCT_TYPE = "HPGE_DET_LEAK"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HPGE_DET_LEAK current, in Pico-amps."

/* DATA OBJECT DEFINITION */

OBJECT = E17_TIME_SERIES

NAME = HPGE_DET_LEAK

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E17_TIME_SERIES

END_OBJECT = E17_FILE

OBJECT = E18_FILE

FILE_NAME = "GRS_E182008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E182008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HVPS_TEMP_2_2008015"

PRODUCT_TYPE = "HVPS_TEMP_2"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HVPS_TEMP_2 temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E18_TIME_SERIES

NAME = HVPS_TEMP_2

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E18_TIME_SERIES

END_OBJECT = E18_FILE

OBJECT = E19_FILE

FILE_NAME = "GRS_E192008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E192008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "PREAMP_TEMP_2008015"

PRODUCT_TYPE = "PREAMP_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "PREAMP_TEMP temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E19_TIME_SERIES

NAME = PREAMP_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E19_TIME_SERIES

END_OBJECT = E19_FILE

OBJECT = E20_FILE

FILE_NAME = "GRS_E202008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E202008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "SHAPER_TEMP_2008015"

PRODUCT_TYPE = "SHAPER_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "SHAPER_TEMP temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E20_TIME_SERIES

NAME = SHAPER_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E20_TIME_SERIES

END_OBJECT = E20_FILE

OBJECT = E21_FILE

FILE_NAME = "GRS_E212008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E212008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "AD_TEMP_2008015"

PRODUCT_TYPE = "AD_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "AD_TEMP temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E21_TIME_SERIES

NAME = AD_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E21_TIME_SERIES

END_OBJECT = E21_FILE

OBJECT = E22_FILE

FILE_NAME = "GRS_E222008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E222008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HV_MONITOR_2008015"

PRODUCT_TYPE = "HV_MONITOR"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HV_MONITOR voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E22_TIME_SERIES

NAME = HV_MONITOR

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E22_TIME_SERIES

END_OBJECT = E22_FILE

OBJECT = E23_FILE

FILE_NAME = "GRS_E232008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E232008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "REF_2_5V_2008015"

PRODUCT_TYPE = "REF_2_5V"

/* DESCRIPTIVE data elements */

DESCRIPTION = "REF_2_5V voltage, in Counts."

/* DATA OBJECT DEFINITION */

OBJECT = E23_TIME_SERIES

NAME = REF_2_5V

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E23_TIME_SERIES

END_OBJECT = E23_FILE

OBJECT = E24_FILE

FILE_NAME = "GRS_E242008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E242008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "REF_2_5V_DIV2_2008015"

PRODUCT_TYPE = "REF_2_5V_DIV2"

/* DESCRIPTIVE data elements */

DESCRIPTION = "REF_2_5V_DIV2 voltage ref, in Counts."

/* DATA OBJECT DEFINITION */

OBJECT = E24_TIME_SERIES

NAME = REF_2_5V_DIV2

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E24_TIME_SERIES

END_OBJECT = E24_FILE

OBJECT = E25_FILE

FILE_NAME = "GRS_E252008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E252008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "REF_2_5V_DIV3_2008015"

PRODUCT_TYPE = "REF_2_5V_DIV3"

/* DESCRIPTIVE data elements */

DESCRIPTION = "REF_2_5V_DIV3 current ref, in Counts."

/* DATA OBJECT DEFINITION */

OBJECT = E25_TIME_SERIES

NAME = REF_2_5V_DIV3

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E25_TIME_SERIES

END_OBJECT = E25_FILE

OBJECT = E26_FILE

FILE_NAME = "GRS_E262008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E262008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "CONTROL_BOARD_TEMP_2008015"

PRODUCT_TYPE = "CONTROL_BOARD_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION =

"CONTROL_BOARD_TEMP temperature, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E26_TIME_SERIES

NAME = CONTROL_BOARD_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E26_TIME_SERIES

END_OBJECT = E26_FILE

OBJECT = E27_FILE

FILE_NAME = "GRS_E272008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E272008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "ANNEAL_PRI_VOLT_2008015"

PRODUCT_TYPE = "ANNEAL_PRI_VOLT"

/* DESCRIPTIVE data elements */

DESCRIPTION = "ANNEAL_PRI_VOLT voltage, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E27_TIME_SERIES

NAME = ANNEAL_PRI_VOLT

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E27_TIME_SERIES

END_OBJECT = E27_FILE

OBJECT = E28_FILE

FILE_NAME = "GRS_E282008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E282008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "COOLER_PRI_VOLT_2008015"

PRODUCT_TYPE = "COOLER_PRI_VOLT"

/* DESCRIPTIVE data elements */

DESCRIPTION = "COOLER_PRI_VOLT readings, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E28_TIME_SERIES

NAME = COOLER_PRI_VOLT

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E28_TIME_SERIES

END_OBJECT = E28_FILE

OBJECT = E29_FILE

FILE_NAME = "GRS_E292008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E292008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "ANNEAL_SEC_I_2008015"

PRODUCT_TYPE = "ANNEAL_SEC_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "ANNEAL_SEC_I readings, in Milliamps."

/* DATA OBJECT DEFINITION */

OBJECT = E29_TIME_SERIES

NAME = ANNEAL_SEC_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E29_TIME_SERIES

END_OBJECT = E29_FILE

OBJECT = E30_FILE

FILE_NAME = "GRS_E302008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E302008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "COOLER_SEC_I_2008015"

PRODUCT_TYPE = "COOLER_SEC_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "COOLER_SEC_I readings, in Milliamps."

/* DATA OBJECT DEFINITION */

OBJECT = E30_TIME_SERIES

NAME = COOLER_SEC_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E30_TIME_SERIES

END_OBJECT = E30_FILE

OBJECT = E31_FILE

FILE_NAME = "GRS_E312008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E312008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "COOLER_PRI_I_2008015"

PRODUCT_TYPE = "COOLER_PRI_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "COOLER_PRI_I readings, in Milliamps."

/* DATA OBJECT DEFINITION */

OBJECT = E31_TIME_SERIES

NAME = COOLER_PRI_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E31_TIME_SERIES

END_OBJECT = E31_FILE

OBJECT = E32_FILE

FILE_NAME = "GRS_E322008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E322008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "ANNEAL_PRI_I_2008015"

PRODUCT_TYPE = "ANNEAL_PRI_I"

/* DESCRIPTIVE data elements */

DESCRIPTION = "ANNEAL_PRI_I readings, in Milliamps."

/* DATA OBJECT DEFINITION */

OBJECT = E32_TIME_SERIES

NAME = ANNEAL_PRI_I

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E32_TIME_SERIES

END_OBJECT = E32_FILE

OBJECT = E33_FILE

FILE_NAME = "GRS_E332008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E332008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "COOLER_PWR_BOARD_TEMP_2008015"

PRODUCT_TYPE = "COOLER_POWER_BOARD_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION =

"COOLER_POWER_BOARD_TEMP readings, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E33_TIME_SERIES

NAME = COOLER_POWER_BOARD_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E33_TIME_SERIES

END_OBJECT = E33_FILE

OBJECT = E34_FILE

FILE_NAME = "GRS_E342008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E342008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "COOLER_TEMP_2008015"

PRODUCT_TYPE = "COOLER_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "COOLER_TEMP readings, in Celsius."

/* DATA OBJECT DEFINITION */

OBJECT = E34_TIME_SERIES

NAME = COOLER_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E34_TIME_SERIES

END_OBJECT = E34_FILE

OBJECT = E35_FILE

FILE_NAME = "GRS_E352008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E352008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "CMD_SCIENCE_MODE_2008015"

PRODUCT_TYPE = "CMD_SCIENCE_MODE"

/* DESCRIPTIVE data elements */

DESCRIPTION =

"CMD_SCIENCE_MODE commanded to event classification."

/* DATA OBJECT DEFINITION */

OBJECT = E35_TIME_SERIES

NAME = CMD_SCIENCE_MODE

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E35_TIME_SERIES

END_OBJECT = E35_FILE

OBJECT = E36_FILE

FILE_NAME = "GRS_E362008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E362008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "CMD_HPGE_HV_2008015"

PRODUCT_TYPE = "CMD_HPGE_HV"

/* DESCRIPTIVE data elements */

DESCRIPTION = "CMD_HPGE_HV level, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E36_TIME_SERIES

NAME = CMD_HPGE_HV

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E36_TIME_SERIES

END_OBJECT = E36_FILE

OBJECT = E37_FILE

FILE_NAME = "GRS_E372008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E372008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "CMD_SHIELD_HV_2008015"

PRODUCT_TYPE = "CMD_SHIELD_HV"

/* DESCRIPTIVE data elements */

DESCRIPTION = "CMD_SHIELD_HV level, in Volts."

/* DATA OBJECT DEFINITION */

OBJECT = E37_TIME_SERIES

NAME = CMD_SHIELD_HV

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E37_TIME_SERIES

END_OBJECT = E37_FILE

OBJECT = E38_FILE

FILE_NAME = "GRS_E382008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E382008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "CALIB_AVG_DET_TEMP_2008015"

PRODUCT_TYPE = "CAL_AVG_DET_TEMP"

/* DESCRIPTIVE data elements */

DESCRIPTION = "CAL_AVG_DET_TEMP temperature, in Kelvin."

/* DATA OBJECT DEFINITION */

OBJECT = E38_TIME_SERIES

NAME = CAL_AVG_DET_TEMP

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E38_TIME_SERIES

END_OBJECT = E38_FILE

OBJECT = E39_FILE

FILE_NAME = "GRS_E392008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E392008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "HPGE_HV_SAFING_LVL_2008015"

PRODUCT_TYPE = "HPGE_HV_SAFING_LVL"

/* DESCRIPTIVE data elements */

DESCRIPTION = "HPGE_HV_SAFING_LVL current safing level."

/* DATA OBJECT DEFINITION */

OBJECT = E39_TIME_SERIES

NAME = HPGE_HV_SAFING_LVL

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E39_TIME_SERIES

END_OBJECT = E39_FILE

OBJECT = E40_FILE

FILE_NAME = "GRS_E402008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E402008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "SHLD_HV_SAFING_LVL_2008015"

PRODUCT_TYPE = "SHLD_SAFING_LVL"

/* DESCRIPTIVE data elements */

DESCRIPTION = "SHLD_SAFING_LVL current safing level."

/* DATA OBJECT DEFINITION */

OBJECT = E40_TIME_SERIES

NAME = SHLD_SAFING_LVL

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E40_TIME_SERIES

END_OBJECT = E40_FILE

OBJECT = E41_FILE

FILE_NAME = "GRS_E412008015ZZZ.DAT"

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 47

FILE_RECORDS = 4111

/* POINTERS TO DATA OBJECTS */

^TIME_SERIES = "GRS_E412008015ZZZ.DAT"

/* IDENTIFICATION DATA ELEMENTS */

PRODUCT_ID = "COOLER_TEMP_SETPOINT_2008015"

PRODUCT_TYPE = "COOLER_TEMP_SETPOINT"

/* DESCRIPTIVE data elements */

DESCRIPTION = "COOLER_TEMP_SETPOINT, in Kelvin."

/* DATA OBJECT DEFINITION */

OBJECT = E41_TIME_SERIES

NAME = COOLER_TEMP_SETPOINT

INTERCHANGE_FORMAT = BINARY

ROWS = 4111

ROW_BYTES = 47

SAMPLING_PARAMETER_NAME = TIME

SAMPLING_PARAMETER_UNIT = SECONDS

SAMPLING_PARAMETER_INTERVAL = "N/A"

COLUMNS = 5

^STRUCTURE = "GRS_ENG.FMT"

END_OBJECT = E41_TIME_SERIES

END_OBJECT = E41_FILE

END

8.5.8 GRS_RDR_SUM

PDS_VERSION_ID = "PDS3"

/*** FILE FORMAT ***/

FILE_RECORDS = 16

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 262373

/*** GENERAL DATA DESCRIPTION PARAMETERS ***/

PRODUCT_ID = "GRS_RSS2011083ZZZ_DAT"

PRODUCT_VERSION_ID = "3.0"

PRODUCT_CREATION_TIME = 2015-10-20T09:49:20

PRODUCT_TYPE = "RDR"

STANDARD_DATA_PRODUCT_ID = "GRS_RDR_SUM"

SOFTWARE_NAME = "GRS_CDR_GEN"

SOFTWARE_VERSION_ID = "1.0"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

DATA_SET_ID = "MESS-E/V/H-GRNS-3-GRS-CDR-V1.0"

MISSION_PHASE_NAME = "MERCURY ORBIT"

TARGET_NAME = "MERCURY"

START_TIME = 2011-03-24T01:23:45.669

STOP_TIME = 2011-09-19T15:21:33.251

SPACECRAFT_CLOCK_START_COUNT = "1/209417293"

SPACECRAFT_CLOCK_STOP_COUNT = "1/224933159"

^TABLE = "GRS_RSS2011083ZZZ.DAT"

OBJECT = TABLE

COLUMNS = 52

INTERCHANGE_FORMAT = BINARY

ROWS = 16

ROW_BYTES = 262373

DESCRIPTION =

"This table contains one set of summed spectra

collected from the high purity Germanium (HPGe) detector plus

spatial and temporal information and relevant data from the

time the spectra was taken. A set is defined as all data with

timestamps corresponding to one earth year period.

^STRUCTURE = "GRS_RDR_SUMS.FMT"

END_OBJECT = TABLE

END

8.5.9 GRS_DAP

PDS_VERSION_ID = "PDS3"

PRODUCT_VERSION_ID = "1.0"

DATA_SET_ID = "MESS-E/V/H-GRNS-5-GRS-DAP-V1.0"

PRODUCT_ID = "GRS_DAP_K_ABD_MAP.JP2"

INSTRUMENT_HOST_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

INSTRUMENT_ID = "GRS"

MISSION_PHASE_NAME = "MERCURY ORBIT"

TARGET_NAME = "MERCURY"

START_TIME = 2011-03-24T00:00:00

STOP_TIME = 2011-10-11T23:59:59

SPACECRAFT_CLOCK_START_COUNT = "1/209412268"

SPACECRAFT_CLOCK_STOP_COUNT = "1/226865065"

PRODUCT_CREATION_TIME = 2013-12-19T16:23:56.000

PRODUCER_ID = GRS_TEAM

PRODUCER_FULL_NAME = "PATRICK PEPLOWSKI"

PRODUCER_INSTITUTION_NAME = "APPLIED PHYSICS LABORATORY"

DESCRIPTION = "

Pixel map of count-rate-derived potassium abundances. The image is linearly

scaled such that the maximum pixel value (255) corresponds to a potassium

abundance of 2430 parts per million (ppm). Conversion from Digital Number

(DN) to science value is given by the equation:

SCIENCE_VALUE = (DN * 9.530)

/* The COMPRESSED_FILE object describes the JPEG2000 image file. */

OBJECT = COMPRESSED_FILE

FILE_NAME = "GRS_DAP_K_ABD_MAP.JP2"

RECORD_TYPE = UNDEFINED

FILE_RECORDS = UNK

ENCODING_TYPE = JP2

ENCODING_TYPE_VERSION_NAME = "ISO/IEC15444-1:2004"

INTERCHANGE_FORMAT = BINARY

UNCOMPRESSED_FILE_NAME = "GRS_DAP_K_ABD_MAP.IMG"

REQUIRED_STORAGE_BYTES = "1036800"

^DESCRIPTION = "JP2INFO.TXT"

END_OBJECT = COMPRESSED_FILE

/* The UNCOMPRESSED_FILE object describes the image that would result */

/* from uncompressing the JPEG2000 file. */

OBJECT = UNCOMPRESSED_FILE

RECORD_TYPE = FIXED_LENGTH

FILE_RECORDS = 360

RECORD_BYTES = 2880

^IMAGE = "GRS_DAP_K_ABD_MAP.IMG"

OBJECT = IMAGE

NAME = "GRS POTASSIUM ABUNDANCE MAP"

LINES = 360

LINE_SAMPLES = 720

SAMPLE_TYPE = IEEE_REAL

SAMPLE_BITS = 32

UNIT = PPM

SCALING_FACTOR = 9.530

DERIVED_MINIMUM = 0

DERIVED_MAXIMUM = 2430

MISSING_CONSTANT = 0

END_OBJECT = IMAGE

END_OBJECT = UNCOMPRESSED_FILE

OBJECT = IMAGE_MAP_PROJECTION

^DATA_SET_MAP_PROJECTION = "DSMAP.CAT"

MAP_PROJECTION_TYPE = "SIMPLE CYLINDRICAL"

KEYWORD_LATITUDE_TYPE = "PLANETOCENTRIC"

MAP_RESOLUTION = 2 <pix/degree>

A_AXIS_RADIUS = 2440. <km>

B_AXIS_RADIUS = 2440. <km>

C_AXIS_RADIUS = 2440. <km>

POSITIVE_LONGITUDE_DIRECTION = "EAST"

CENTER_LATITUDE = 0.0 <deg>

CENTER_LONGITUDE = 0.0 <deg>

LINE_FIRST_PIXEL = 1

LINE_LAST_PIXEL = 360

SAMPLE_FIRST_PIXEL = 1

SAMPLE_LAST_PIXEL = 720

MAP_PROJECTION_ROTATION = 0.0

MAP_SCALE = 21 <km/pix>

MAXIMUM_LATITUDE = 90 <deg>

MINIMUM_LATITUDE = -90 <deg>

WESTERNMOST_LONGITUDE = -180 <deg>

EASTERNMOST_LONGITUDE = 180 <deg>

LINE_PROJECTION_OFFSET = 180.0

SAMPLE_PROJECTION_OFFSET = 360.0

COORDINATE_SYSTEM_TYPE = "BODY-FIXED ROTATING"

COORDINATE_SYSTEM_NAME = "PLANETOCENTRIC"

END_OBJECT = IMAGE_MAP_PROJECTION

END

8.5.10 INDEX

PDS_VERSION_ID = PDS3

RECORD_TYPE = FIXED_LENGTH

RECORD_BYTES = 328

FILE_RECORDS = 73952

^INDEX_TABLE = "INDEX.TAB"

VOLUME_ID = MESSGRS_2001

DATA_SET_ID = {"MESS-E/V/H-GRNS-3-GRS-CDR-V1.0",

"MESS-E/V/H-GRNS-5-GRS-DAP-V1.0"}

MISSION_NAME = "MESSENGER"

INSTRUMENT_NAME = "GAMMA RAY SPECTROMETER"

START_TIME = 2004-08-12T22:01:55.7

STOP_TIME = 2014-09-17T23:38:32.0

PRODUCT_CREATION_TIME = 2014-11-10T12:55:13.0

DESCRIPTION = "This index file lists information

about each of the MESSENGER GRS CDR/RDR/DAP data products contained on

this archive volume."

OBJECT = INDEX_TABLE

INTERCHANGE_FORMAT = ASCII

ROW_BYTES = 328

ROWS = 73952

COLUMNS = 15

INDEX_TYPE = SINGLE

OBJECT = COLUMN

COLUMN_NUMBER = 1

NAME = VOLUME_ID

DATA_TYPE = CHARACTER

START_BYTE = 2

BYTES = 12

DESCRIPTION = "The volume on which a data product is

stored."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 2

NAME = PATH_NAME

DATA_TYPE = CHARACTER

START_BYTE = 17

BYTES = 24

DESCRIPTION = "The full directory path to the file

relative to the volume root directory."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 3

NAME = FILE_NAME

DATA_TYPE = CHARACTER

START_BYTE = 44

BYTES = 31

DESCRIPTION = "The name of the file containing a data

product's PDS label."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 4

NAME = PRODUCT_ID

DATA_TYPE = CHARACTER

START_BYTE = 78

BYTES = 36

DESCRIPTION = "Unique identifier for a GRS CDR/RDR product."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 5

NAME = PRODUCT_TYPE

DATA_TYPE = CHARACTER

START_BYTE = 117

BYTES = 27

DESCRIPTION = "Type of GRS product."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 6

NAME = PRODUCT_CREATION_TIME

DATA_TYPE = TIME

START_BYTE = 146

BYTES = 24

DESCRIPTION = "UTC date and time that a product

was created, in the format

yyyy-mm-ddThh:mm:ss."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 7

NAME = PRODUCT_VERSION_ID

DATA_TYPE = CHARACTER

START_BYTE = 172

BYTES = 10

DESCRIPTION = "The version identifier of the product.

The first version of a product is

version 1.0. If the product is revised

and re-released, the version ID is

incremented."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 8

NAME = RELEASE_ID

DATA_TYPE = CHARACTER

START_BYTE = 185

BYTES = 4

DESCRIPTION = "The ID of the Messenger mission data

release. The first release is 0001,

followed by 0002, etc."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 9

NAME = MISSION_PHASE_NAME

DATA_TYPE = CHARACTER

START_BYTE = 192

BYTES = 30

DESCRIPTION = "Common identifier for a given phase

of the mission."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 10

NAME = TARGET_NAME

DATA_TYPE = CHARACTER

START_BYTE = 225

BYTES = 11

DESCRIPTION = "Planetary body that is the target of

observation; e.g., MERCURY."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 11

NAME = START_TIME

DATA_TYPE = TIME

START_BYTE = 238

BYTES = 24

DESCRIPTION = "UTC date and time at the beginning

of data acquisition for this product,

in the format yyyy-mm-ddThh:mm:ss."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 12

NAME = STOP_TIME

DATA_TYPE = TIME

START_BYTE = 263

BYTES = 24

DESCRIPTION = "UTC date and time at the end of

data acquisition for this product,

in the format yyyy-mm-ddThh:mm:ss."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = START_MET_PARTITION

COLUMN_NUMBER = 13

START_BYTE = 288

BYTES = 3

DATA_TYPE = ASCII_INTEGER

DESCRIPTION = "The MET partition (roll-over count)

associated with the

SPACECRAFT_CLOCK_START_COUNT value (column

14). This value is incremented by 1 for

every instance where MET values have been

reset."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 14

NAME = SPACECRAFT_CLOCK_START_COUNT

DATA_TYPE = CHARACTER

START_BYTE = 293

BYTES = 15

DESCRIPTION = "Value of the spacecraft clock at

the beginning of data acquisition

for this product."

END_OBJECT = COLUMN

OBJECT = COLUMN

COLUMN_NUMBER = 15

NAME = SPACECRAFT_CLOCK_STOP_COUNT

DATA_TYPE = CHARACTER

START_BYTE = 311

BYTES = 15

DESCRIPTION = "Value of the spacecraft clock at

the end of data acquisition for this

product."

END_OBJECT = COLUMN

END_OBJECT = INDEX_TABLE

END

8.6 Appendix: GRS CDR/RDR Data Columns

This table lists the columns in all GRS CDR/RDR files in alphabetical order. The format of each type of data, including column locations, sizes, data types, units and full descriptions, can be found in the format files (*.FMT) in the LABEL directory.

Column Name	Description	Appears In
ACCUM_TIME	Accumulation time, in seconds, of the HPGe detector. Accumulation time, in seconds, of the Shield detector. The time period over which the rates were accumulated.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2 GRS_CAL_SH3 GRS_CAL_SCR
ACCUMULATED_DEAD_TIME	Counter for accumulated dead time	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
AC_GAMMA_SPECTRUM	Summed uncorrected anti-coincidence gamma spectrum representing cumulative counts of gamma rays at the detector, binned over TBD latitude and longitude, and one Earth year	GRS_RDR_SUM
AD_TEMP	Channel 06, AD Temperature, smoothed and interpolated to the center of the collection interval.	GRS_CAL_SH GRS_CAL_SH2
ALL_CH0_CH1_EVENTS	All channel 0 and channel 1 events. Excludes inverted Channel 0, Pileups, and Pulser events	GRS_CAL_AC GRS_CAL_RAW
ALL_CH0_EVENTS	All single Channel 0 events - either singlet or fails crossing time criterion	GRS_CAL_AC GRS_CAL_RAW
ALL_CH1_EVENTS	All single Channel 1 events - either singlet or fails crossing time criterion	GRS_CAL_AC GRS_CAL_RAW
ALL_EVENTS	total count of gamma events	GRS_CAL_AC GRS_CAL_RAW
ALL_VALID_COINCIDENT	All valid coincidence events - both Channel 0 and Channel 1 valid.	GRS_CAL_AC GRS_CAL_RAW
ALTITUDE	Spacecraft altitude above the subsatellite point on the target in units of km.	GRS_CAL_SH3 GRS_CAL_SCR
ALTITUDE_MIN	Minimum altitude during the period of the SUM	GRS_RDR_SUM
ALTITUDE_MAX	Maximum altitude during the period of the SUM	GRS_RDR_SUM
ALTITUDE_MEAN	Mean altitude during the period of the SUM	GRS_RDR_SUM
ALTITUDE_STD	Standard deviation of altitude during the period of the SUM	GRS_RDR_SUM
AZIMUTH	Spacecraft LVLH (Local Vertical/Local Horizontal) azimuth is measured counterclockwise about Z LVLH axis from X LVLH axis where the spacecraft z-axis is aligned with the vector from planet center to the spacecraft, y axis is aligned with the instaneous orbit angular momentum and the x-axis completes a right-handed coordinate system and points in the direction of motion along the orbit	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
BAD_DATA_FLAG	Intended for use as a bit-string bad data flag to indicate specific problems associated with the data. Values are expected to be assigned to specific bits as problems are identified during the course of the mission. Bit 1 - The high voltage is not on, is being ramped or has not been stable long enough. Bit 2 - Indicates a change in the analog pulse processing system gain setting. Bit 3 - Indicates a spectrum where the temperatures used for correction have fluctuated by greater than 5 percent from previous readings. Bit 4 - Indicates gamma spectra collected during a solar particle event. These spectra should not be combined with spectra collected under normal solar conditions. Bit 5 - Pulser data is not combined with the spectrum. Bit 6 - Indicates gamma spectra collected during a solar flare event. These spectra should not be combined with spectra collected under normal solar conditions. Bit 7 - Indicates gamma spectra collected during periods of decreased GS detector spectral resolution. These spectra should not be combined with spectra collected under "normal" detector conditions. Bit 8 - Not all data channels were received on the ground. Bit 9 - Indicates a unique problem with single spectrum. Bit 10 - The high voltage has not been stable long enough. Bit 11 - This data was taken during a time when the spectra were particularly noisy. Many channels have far too many counts, especially the lower channels. Indicates data quality via flag of “0” or “1”. Values of 1 indicate that the data quality is poor, for example increased backgrounds due to solar particle events, or that the detector was not operating nominally, for example the bias voltage was off. Values of 0 indicate that the data are clean and suited for analysis.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2 GRS_RDR_SUM GRS_CAL_SH3 GRS_CAL_SCR
BETA_ANGLE	Angle of the normal of the spacecraft orbital plane with respect to Mercury-to-Sun vector in degrees.	GRS_CAL_SH3 GRS_CAL_SCR
CAL_AC	Temperature corrected Anti-coincidence spectrum	GRS_CAL_AC
CALIB_AVG_DET_TEMP	Calibrated, averaged detector temperature, smoothed and interpolated to the center of the collection interval	GRS_CAL_AC GRS_CAL_RAW
CALIB_AVG_DET_TEMP_MIN	Minimum temp during the period of the SUM	GRS_RDR_SUM
CALIB_AVG_DET_TEMP_MAX	Maximum temp during the period of the SUM	GRS_RDR_SUM
CALIB_AVG_DET_TEMP_MEAN	Mean temp during the period of the SUM	GRS_RDR_SUM
CALIB_AVG_DET_TEMP_STD	Standard deviation of temp during the period of the SUM	GRS_RDR_SUM
CAL_RAW	Temperature corrected Raw spectrum	GRS_CAL_RAW
CAL_SH	Spectra of light pulses produced from interaction of a gamma ray with the plastic scintillator shield. Contains the corrected counts in each of the 1024 bins after 1 accumulation period.	GRS_CAL_SH
CH0_PILEUP_REJECT	Channel 0 pileup rejected events. Only if pileup rejection is enabled.	GRS_CAL_AC GRS_CAL_RAW
CLOCK_TIME	Sum of collection durations	GRS_RDR_SUM
CORRECTED_AC_GAMMA_SPECTRUM	Summed corrected anti-coincidence gamma spectrum representing cumulative counts of gamma rays at the detector, binned over TBD latitude and longitude, and one Earth year.	GRS_RDR_SUM
CORRECTED_GAMMA_SPECTRUM	Summed corrected raw gamma spectrum representing cumulative counts of gamma rays at the detector, binned over some latitude and longitude, and one Earth year.	GRS_RDR_SUM
DEADTIME_FRAC	Fraction of accumulation time (ACCUM_TIME) for which the GRS electronics were unable to process an event and were therefore insensitive to possible additional events. Calculated from the raw engineering value ACCUMULATED_DEAD_TIME.	GRS_CAL_SCR GRS_CAL_SH3
DELTA_ANGLE	Difference between instrument +y direction and true north at the middle of the collection interval.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
ENG_VAL	Raw value transformed to a physical unit.	GRS_ENG
FIFO_FULL_COUNT	Hardware FIFO full flag tested for all events.	GRS_CAL_AC GRS_CAL_RAW
GAIN	Default value of gain, keV / channel.	GRS_RDR_SUM
GRS_PRIORITY_LEVEL	Indicates the type of priority assigned to the science packet. The priority level is tied to the ApID of the packet. Priority level varies from 0-3, 0 being highest and 3 being lowest priority.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SCR GRS_CAL_SH GRS_CAL_SH2 GRS_CAL_SH3
HPGE_AC	Anti-coincident (AC) spectra accumulated by the HPGe detector. Contains the counts in each of the 16384 bins after accumulation period.	GRS_CAL_AC
HPGE_CHARGE_RESETS	Number of HPGe charge resets	GRS_CAL_AC GRS_CAL_RAW
HPGE_FAST	Fast Neutron spectrum about the 478-keV line, normalized to 0.60 keV energy bins.	GRS_CAL_SH2
HPGE_RAW_EVENTS	Counter of HPGe Raw events	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
HPGE_TEMP_1	Channel 00, HPGE Detector Temperature 1, smoothed and interpolated to the center of the collection interval	GRS_CAL_AC GRS_CAL_RAW
HPGE_TEMP_1_MIN	Minimum temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_1_MAX	Maximum temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_1_MEAN	Mean temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_1_STD	Standard deviation of temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_2	Channel 01, HPGE Detector Temperature 2, smoothed and interpolated to the center of the collection interval	GRS_CAL_AC GRS_CAL_RAW
HPGE_TEMP_2_MIN	Minimum temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_2_MAX	Maximum temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_2_MEAN	Mean temp during the period of the SUM	GRS_RDR_SUM
HPGE_TEMP_2_STD	Standard deviation of temp during the period of the SUM	GRS_RDR_SUM
HPGE_THERMAL	Thermal Neutron spectrum about the 478-keV line, normalized to 0.60 keV energy bins.	GRS_CAL_SH2
HV_MONITOR	Channel 07, HV Monitor, smoothed, and interpolated to the center of the collection interval	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
HV_MONITOR_MIN	Minimum volt during the period of the SUM	GRS_RDR_SUM
HV_MONITOR_MAX	Maximum volt during the period of the SUM	GRS_RDR_SUM
HV_MONITOR_MEAN	Mean volt during the period of the SUM	GRS_RDR_SUM
HV_MONITOR_STD	Standard deviation of volt during the period of the SUM	GRS_RDR_SUM
HVPS_REF_VOLT	HVPS Reference Voltage, smoothed, and interpolated to the center of the collection interval.	GRS_CAL_SH GRS_CAL_SH2
HVPS_TEMP	Channel 03, HVPS Temperature, smoothed and interpolated to the center of the collection interval.	GRS_CAL_SH GRS_CAL_SH2
HVPS_VOLT	HVPS Voltage, smoothed and interpolated to the center of the collection interval.	GRS_CAL_SH GRS_CAL_SH2
INITIAL_ENERGY	The energy of the middle of the first bin of the FAST and THERMAL NEURTON HPGE spectra.	GRS_CAL_SH2
INSTR_BORESIGHT_MERCURY	Sub instrument boresight (x,y,z) in Mercury fixed coordinates at the middle of the collection interval.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
INTERSECTING	True if the pointing vector intersects Mercury.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
INVALID_COINCIDENT_CH0	Channel 0 out-of-range coincidence events	GRS_CAL_AC GRS_CAL_RAW
INVALID_COINCIDENT_CH1	Channel 1 out-of-range coincidence events.	GRS_CAL_AC GRS_CAL_RAW
INVALID_PULSER_EVENTS	Out-of-range pulser events.	GRS_CAL_AC GRS_CAL_RAW
INVALID_SINGLE_CH0	Single channel 0 out-of-range events	GRS_CAL_AC GRS_CAL_RAW
INVALID_SINGLE_CH1	Single channel 1 out-of-range events	GRS_CAL_AC GRS_CAL_RAW
INVERTED_CH0	Channel 0 events flagged 'inverted' by the hardware.	GRS_CAL_AC GRS_CAL_RAW
J2000_ET	Ephemeris time converted from MESSENGER MET.	GRS_CAL_SH3 GRS_CAL_SCR
JDAY	Julian date at the start of the time period of interest. Julian date is defined as an integer count of days elapsed since noon, January 1, 4713 B.C. The value includes the fractional portion of the Julian day.	GRS_CAL_SH3 GRS_CAL_SCR
LATITUDE	Target-centric latitude of the spacecraft subsatellite point in degrees. Center latitude of a spectral sum.	GRS_CAL_SH3 GRS_CAL_SCR GRS_RDR_SUM
LATITUDE_MIN	Minimum latitude during the period of the SUM	GRS_RDR_SUM
LATITUDE _MAX	Maximum latitude during the period of the SUM	GRS_RDR_SUM
LATITUDE _MEAN	altitude adjusted Mean latitude during the period of the SUM	GRS_RDR_SUM
LATITUDE _STD	Standard deviation of latitude during the period of the SUM	GRS_RDR_SUM
LOCAL_HOUR	Local Sun hour at the sub-spacecraft point.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
LOCAL_MINUTE	Local Sun minute at the sub-spacecraft point.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
LOCAL_TIME	Local time of the spacecraft subsatellite point in hours from 0 to 24.	GRS_CAL_SH3 GRS_CAL_SCR
LONGITUDE	Target-centric longitude of the spacecraft subsatellite point in degrees. Center longitude of a spectral sum.	GRS_CAL_SH3 GRS_CAL_SCR GRS_RDR_SUM
LONGITUDE_MIN	Minimum longitude during the period of the SUM	GRS_RDR_SUM
LONGITUDE _MAX	Maximum llongitude during the period of the SUM	GRS_RDR_SUM
LONGITUDE _MEAN	altitude adjusted Mean longitude during the period of the SUM	GRS_RDR_SUM
LONGITUDE _STD	Standard deviation of longitude during the period of the SUM	GRS_RDR_SUM
MERCURY_SOL	Longitude of the Sun at 0 hours UT on the date of the record. Taken from the Association of Lunar and Planetary Observers 'Ephemeris for Physical Observation of Mercury'.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
MERCURY_CENTRIC_LATITUDE	Sub spacecraft latitude in Mercury fixed coordinates at the middle of the collection interval.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
MERCURY_CENTRIC_LONGITUDE	Sub spacecraft longitude in Mercury fixed coordinates at the middle of the collection interval. Longitude increases towards the East.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
MET	Mission elapsed time, in seconds, corresponding to the start of the accumulation period for the spectra.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SCR GRS_CAL_SH GRS_CAL_SH2 GRS_CAL_SH3 GRS_ENG
MIDPOINT_MET	The mission elapsed time at the midpoint of the HPGE Raw observation. Defined as: MET at the start of the observation + (ACCUM_TIME / 2).	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
MET_START_TIME	Mission elapsed time, in seconds, corresponding to the start of the SUM	GRS_RDR_SUM
MET_STOP_TIME	Mission elapsed time, in seconds, corresponding to the end of the SUM	GRS_RDR_SUM
MISSING_DATA_PACKETS	The value represents a 16-bit binary number where each bit indicates whether an HPGe Raw telemetry packet is missing from the EDR. Each HPGe Raw EDR consists of information extracted from 16 telemetry packets in a complete observation. The least significant bit is a flag corresponding to the first of 16 packets and the most significant bit is a flag corresponding to the 16^th packet. A bit value of 1 indicates that a given packet is missing from the EDR. For example, a value of 0 in this column indicates that the spectra from all 16 packets have been downloaded and included in the HPGE_RAW spectra for this EDR. A value of 3 indicates that the spectra information from the first and second packets are missing and therefore spectral bins 0-2047 should be discounted from analysis of the HPGE_RAW spectra.	GRS_CAL_AC GRS_CAL_RAW
NADIR_ANGLE	Spacecraft LVLH (Local Vertical/Local Horizontal) elevation angle plus 90 degrees where the LVLH elevation angle is measured from the XY LVLH plane positive in the +z LVLH half-plane (away from the planet) where the spacecraft z-axis is aligned with the vector from the planet center to the spacecraft, y axis is aligned with the instaneous orbit angular momentum and the x-axis completes a right-handed coordinate system and points in the direction of motion along the orbit. Spacecraft orientation angle of the spacecraft z-axis and the spacecraft-to-planet center vector in units of degrees.	GRS_CDR_AC GRS_CDR_RAW GRS_CDR_SH GRS_CALSH2 GRS_CAL_SH3 GRS_CAL_SCR
NEUTRON_EVENTS	Coincidence events that meet neutron criterion.	GRS_CAL_AC GRS_CAL_RAW
NUMBER_OF_BINS	Number of bins in the raw spectra. Number of bins in the shield spectra.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH3 GRS_CAL_SCR
NUM_BUFFERED_EVENTS	The number of bytes in the raw event buffer. The number of events in the raw event buffer is (Raw Bytes-16)/8. The number of raw events in the buffer will range from 0 to 126. Note there must be at least one event in the buffer before the Event Buffer Header will be generated.	GRS_CAL_SH2
NUM_RAW_EVENTS	This value contains a count of the total number of raw events detected and is not limited by the length of the buffer. This counter will rollover if the count exceeds 65,535.	GRS_CAL_SH2
OFFSET	The correction offset	GRS_RDR_SUM
ORBIT_NUMBER	Orbit number is a unique identifier for a given orbit of the MESSENGER spacecraft around Mercury. Orbit number is defined as starting at apoherm and is calculated using the MET value and the appropriate SPICE kernels. Orbit numbering does not start until MESSENGER performs the Mercury orbit insertion. Until that time the value for orbit number is 0.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SCR GRS_CAL_SH GRS_CAL_SH2 GRS_CAL_SH3
PHI_ANGLE	Azimuthal angle look direction (in a theta,phi spherical geometry) of the spacecraft in the spacecraft-fixed coordinate system. PHI_ANGLE = 0 degrees is when the spacecraft x-axis points along the direction of travel.	GRS_CAL_SH3 GRS_CAL_SCR
POINTING	True if pointing data was available.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
PREAMP_TEMP	Channel 04, Pre Amp Temperature, smoothed and interpolated to the center of the collection interval	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SCR GRS_CAL_SH GRS_CAL_SH2 GRS_CAL_SH3
PREAMP_TEMP_MIN	Minimum temp during the period of the SUM	GRS_RDR_SUM
PREAMP_TEMP_MAX	Maximum temp during the period of the SUM	GRS_RDR_SUM
PREAMP_TEMP_MEAN	Mean temp during the period of the SUM	GRS_RDR_SUM
PREAMP_TEMP_STD	Standard deviation of temp during the period of the SUM	GRS_RDR_SUM
PULSER_ENERGY_SUM	Pulser energy sum. Summation of (Pulser Ener–y - Offset).	GRS_CAL_AC GRS_CAL_RAW
PULSER_ENERGY_SUM2	Pulser energy sum squared. Summation of square of (Pulser Ener–y - Offset).	GRS_CAL_AC GRS_CAL_RAW
PULSER_EVENTS	Number of valid pulser events.	GRS_CAL_AC GRS_CAL_RAW
PULSER_OFFSET	Pulser energy offset used to form PULSER_ENERGY_SUM and PULSER_ENERGY_SUM2.	GRS_CAL_AC GRS_CAL_RAW
RAW_GAMMA_SPECTRUM	Summed uncorrected raw gamma spectrum representing cumulative counts of gamma rays at the detector, binned over some latitude and longitude, and one Earth year.	GRS_RDR_SUM
RAW_VAL	The raw digital value of the reading as output from the analog-to-digital converter.	GRS_ENG
RECORD_COUNT	Number of records summed	GRS_RDR_SUM
SCALT	Mercury centric altitude of the sub-spacecraft point in Mercury-fixed rotating frame at the middle of the collection interval.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
SC_TO_NADIR_ROT	Nine element rotation matrix that converts the spacecraft attitude from instrument-fixed coordinates to nadir-fixed coordinates.	GRS_CAL_SH3 GRS_CAL_SCR
SHAPER_TEMP	Channel 05, Shaper Temperature, smoothed and interpolated to the center of the collection interval	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SCR GRS_CAL_SH GRS_CAL_SH2 GRS_CAL_SH3
SHAPER_TEMP_MIN	Minimum temp during the period of the SUM	GRS_RDR_SUM
SHAPER_TEMP_MAX	Maximum temp during the period of the SUM	GRS_RDR_SUM
SHAPER_TEMP_MEAN	Mean temp during the period of the SUM	GRS_RDR_SUM
SHAPER_TEMP_STD	Standard deviation of temp during the period of the SUM	GRS_RDR_SUM
SHIELD	Spectra of light pulses produced from interaction of a gamma ray with the plastic scintillator shield. Contains the counts in each of the 1024 bins after 1 accumulation period.	GRS_CAL_SH GRS_CAL_SH3
SHIELD_CHARGE_RESETS	Number of SHIELD charge resets.	GRS_CAL_AC GRS_CAL_RAW
SHIELD_COUNT_SPECTRA	High-time-resolution counter of the total event rate in the shield detector. Counter operates at a 10ms cadence for the duration of the accumulation period, resulting in a series of measurements that populate the 16384 channel spectrum. When fewer than 16384 channels are required, the remainder are set to zero. When more than 16384 channels are required, the last channel represents the sum of all measurements made after the array is filled. For all cases, the first approximately fifty channels are zero due to signal processing deadtime in the GRS electronics.	GRS_CAL_SCR
SHIELD_FAST	Raw Fast Neutron spectrum about the 478-keV line.	GRS_CAL_SH2
SHIELD_RAW_EVENTS	Counter for SHIELD raw events	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
SHIELD_SHIFTS_NEUTRON	The number of right shifts (divide by 2s) that are applied to raw shield pulse heights prior to binning in either the Shield Thermal Events spectrum or the Shield Fast Events spectrum. Possible values are 2 or 3. A value of two effectively increases the binning resolution but decreases the dynamic range (maximum binned energy).	GRS_CAL_SH2
SHIELD_SHIFTS_RAW	The number of right shifts (divide by 2s) that are applied to raw shield pulse heights prior to binning in the Shield All Events spectrum. Possible values are 2 or 3. A value of two effectively increases the binning resolution but decreases the dynamic range (maximum binned energy).	GRS_CAL_SH2
SHIELD_THERMAL	Raw Thermal Neutron spectrum about the 478-keV line.	GRS_CAL_SH2
SHLD_CHRG_RSET_1SEC	Hardware Shield charge reset 1-second total.	GRS_CAL_SH3 GRS_CAL_SCR
SMOOTH_VAL	Raw value transformed to a physical unit.	GRS_ENG
START_BIN	Start Bin of the HPGe detector. Start Bin of the Shield detector. Starting bin for the Shield Count Rate measurements. Initially values may be zero due to detector electronics deadtime.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH3 GRS_CAL_SCR
SUM_TYPE	The type of sum, 0 - Full Planet, 1 - Full Planet less than 2000 kilometer altitude, 2 - Full Planet altitude between 2000 and 8000 kilometers, 3 - Full Planet altitude greater than 8000 kilometers, 4 - Full Planet altitude greater than 15000 kilometers, 5 - North pole (latitude >= 80) with altitude < 2000 kilometers, 6 - 15 x 15 degree cells above 45 degrees latitude with altitude < 2000 kilometers, 7 - 45 x 45 degree cells between 0 and 45 degrees latitude with altitude < 2000 kilometers.	GRS_RDR_SUM
SUN_DISTANCE	Distance of the spacecraft to the Sun in units of km.	GRS_CAL_SH3 GRS_CAL_SCR
THETA_ANGLE	Polar angle look direction (in a theta,phi spherical geometry) of the spacecraft in the spacecraft-fixed coordinate system. THETA_ANGLE = 0 degrees is when the spacecraft z-axis points in the same direction as the spacecraft-to-planet center vector (nadir pointing).	GRS_CAL_SH3 GRS_CAL_SCR
TRIPLE	Triple coincidence count rate in the MESSENGER Neutron Spectrometer. This value is a known proxy for the spacecraft-incident galactic cosmic ray flux.	GRS_CAL_SH3 GRS_CAL_SCR
TWIST_ANGLE	Spacecraft LVLH (Local Vertical/Local Horizontal) twist angle is measured positive about +z body axis where the spacecraft z-axis is aligned with the vector from planet center to the spacecraft, y axis is aligned with the instantaneous orbit angular momentum and the x-axis completes a right-handed coordinate system and points in the direction of motion along the orbit.	GRS_CDR_AC GRS_CDR_RAW GRS_CDR_SH GRS_CDR_SH2
UTC	MET converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss.	GRS_ENG
UTC_MIDPOINT_MET	MIDPOINT_MET converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss.	GRS_CAL_AC GRS_CAL_RAW GRS_CAL_SH GRS_CAL_SH2
UTC_START_TIME	Start UTC of a SUM	GRS_RDR_SUM
UTC_STOP_TIME	Stop UTC of a SUM	GRS_RDR_SUM
VALID_COINCIDENT_CH0	Coincidence channel 0 valid events	GRS_CAL_AC GRS_CAL_RAW
VALID_COINCIDENT_CH1	Coincidence channel 1 valid events.	GRS_CAL_AC GRS_CAL_RAW
VALID_SINGLE_CH0	Single channel 0 valid events only	GRS_CAL_AC GRS_CAL_RAW
VALID_SINGLE_CH1	Single channel 1 valid events only.	GRS_CAL_AC GRS_CAL_RAW
VDOT_X	Velocity normalized dot product of the vector velocity and the spacecraft x-axis unit vector expressed as a unitless number from -1 to 1.	GRS_CAL_SH3 GRS_CAL_SCR
VDOT_Y	Velocity normalized dot product of the vector velocity and the spacecraft y-axis unit vector expressed as a unitless number from -1 to 1.	GRS_CAL_SH3 GRS_CAL_SCR
VDOT_Z	Velocity normalized dot product of the vector velocity and the spacecraft z-axis unit vector expressed as a unitless number from -1 to 1.	GRS_CAL_SH3 GRS_CAL_SCR
VEl_NORM	Magnitude of the spacecraft velocity as expressed in the nadir-fixed coordinate system in units of km/second.	GRS_CAL_SH3 GRS_CAL_SCR
VELOCITY_VECTOR	Three element spacecraft velocity vector expressed in the nadir-fixed coordinate system with each component in units of km/second.	GRS_CAL_SH3 GRS_CAL_SCR
XAXIS_ANGLE	Spacecraft orientation angle of the spacecraft x-axis and the spacecraft-to-planet center vector in units of degrees.	GRS_CAL_SH3 GRS_CAL_SCR
YAXIS_ANGLE	Spacecraft orientation angle of the spacecraft y-axis and the spacecraft-to-planet center vector in units of degrees.	GRS_CAL_SH3 GRS_CAL_SCR
ZCT_FAST_MAX	Window parameter that sets the maximum time difference between shield and HpGe triggers for an event to be considered a fast neutron. Units are 100 ns/tick. Parameter is exclusive, i.e., values equal to this parameter are rejected.	GRS_CAL_SH2
ZCT_FAST_MIN	Window parameter that sets the minimum acceptable time difference between shield and HpGe triggers for an event to be considered a fast neutron. Units are 100 ns/tick. Parameter is inclusive, i.e., values equal to this parameter are accepted.	GRS_CAL_SH2
ZCT_THERM_MAX	Window parameter that sets the maximum acceptable time difference between shield and HpGe triggers for an event to be considered a thermal neutron. Units are 100 ns/tick. Parameter is exclusive, i.e., values equal to this parameter are rejected.	GRS_CAL_SH2
ZCT_THERMAL_MIN	Window parameter that sets the minimum acceptable time difference between shield and HpGe triggers for an event to be considered a thermal neutron. Units are 100 ns/tick. Parameter is inclusive, i.e., values equal to this parameter are accepted.	GRS_CAL_SH2

8.7 Appendix: GRS PDS FMT Files

8.7.1 Appendix: GRS_CAL_RAW.FMT

OBJECT = COLUMN

NAME = MET

COLUMN_NUMBER = 1

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 1

UNIT = Seconds

DESCRIPTION = "Mission elapsed time, in seconds, corresponding to the

start of the accumulation period for the spectra."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ACCUM_TIME

COLUMN_NUMBER = 2

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 5

UNIT = Seconds

DESCRIPTION = "Accumulation time, in seconds, of the HPGe detector."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MIDPOINT_MET

COLUMN_NUMBER = 3

BYTES = 4

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 9

UNIT = Seconds

DESCRIPTION = "The mission elapsed time at the midpoint of the HPGE Raw

observation. Defined as:

MET at the start of the observation + (ACCUM_TIME / 2)."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = ORBIT_NUMBER

COLUMN_NUMBER = 4

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 13

DESCRIPTION = "Orbit number is a unique identifier for a given orbit of

the MESSENGER spacecraft around Mercury. Orbit number is defined as

starting at apoherm and is calculated using the MET value and the

appropriate SPICE kernels. Orbit numbering does not start until MESSENGER

performs the Mercury orbit insertion. Until that time the value for orbit

number is 0."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = START_BIN

COLUMN_NUMBER = 5

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 15

DESCRIPTION = "Start Bin of the HPGe detector."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = NUMBER_OF_BINS

COLUMN_NUMBER = 6

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 17

DESCRIPTION = "Number of bins in the raw spectra."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = GRS_PRIORITY_LEVEL

COLUMN_NUMBER = 7

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 19

DESCRIPTION = "Indicates the type of priority assigned to the science

packet. The priority level is tied to the ApID of the packet. Priority

level varies from 0-3, 0 being highest and 3 being lowest priority."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MISSING_DATA_PACKETS

COLUMN_NUMBER = 8

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 21

DESCRIPTION = "The value represents a 16-bit binary number where each bit

indicates whether an HPGe Raw telemetry packet is missing from the EDR.

Each HPGe Raw EDR consists of information extracted from 16 telemetry

packets in a complete observation. The least significant bit is a flag

corresponding to the first of 16 packets and the most significant bit is

a flag corresponding to the 16th packet. A bit value of 1 indicates that

a given packet is missing from the EDR.

For example, a value of 0 in this column indicates that the spectra from

all 16 packets have been downloaded and included in the HPGE_RAW spectra

for this EDR. A value of 3 indicates that the spectra information from

the first and second packets are missing and therefore spectral bins

0-2047 should be discounted from analysis of the HPGE_RAW spectra."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = BAD_DATA_FLAG

COLUMN_NUMBER = 9

BYTES = 2

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 23

DESCRIPTION = "Intended for use as a bit-string bad data flag to

indicate specific problems associated with the data. Values are expected

to be assigned to specific bits as problems are identified during the

course of the mission.

Bit 1 - The high voltage is not on, is being ramped or has not

been stable long enough.

Bit 2 - Indicates a change in the analog pulse processing system

gain setting.

Bit 3 - Indicates a spectrum where the temperatures used for

correction have fluctuated by greater than 5 percent

from previous readings.

Bit 4 - Indicates gamma spectra collected during a solar

particle event. These spectra should not be combined

with spectra collected under normal solar conditions.

Bit 5 - Pulser data is not combined with the spectrum.

Bit 6 - Indicates gamma spectra collected during a solar flare

event. These spectra should not be combined with spectra

collected under normal solar conditions.

Bit 7 - Indicates gamma spectra collected during periods of

decreased GS detector spectral resolution. These spectra

should not be combined with spectra collected under

'normal' detector conditions.

Bit 8 - Not all data channels were received on the ground.

Bit 9 - Indicates a unique problem with single spectrum.

Bit 10 - The high voltage has not been stable long enough.

Bit 11 - This data was taken during a time when the spectra

were particularly noisy. Many channels have far too

many counts, especially the lower channels."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = CAL_RAW

COLUMN_NUMBER = 10

BYTES = 65536

DATA_TYPE = IEEE_REAL

START_BYTE = 25

ITEMS = 16384

ITEM_BYTES = 4

DESCRIPTION = "Spectra accumulated by the HPGe detector. Contains

the corrected counts in each of the 16384 bins after 1 accumulation

period."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = UTC_MIDPOINT_MET

COLUMN_NUMBER = 11

BYTES = 23

DATA_TYPE = CHARACTER

START_BYTE = 65561

DESCRIPTION = "midpoint_met converted to UTC, stored as

yyyy-mm-ddThh:mm:ss.sss."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MERCURY_CENTRIC_LATITUDE

COLUMN_NUMBER = 12

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65584

UNIT = DEGREE

DESCRIPTION = "Sub spacecraft latitude in Mercury fixed coordinates

at the middle of the collection interval."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MERCURY_CENTRIC_EAST_LONGITUDE

COLUMN_NUMBER = 13

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65592

UNIT = DEGREE

DESCRIPTION = "Sub spacecraft longitude in Mercury fixed coordinates at

the middle of the collection interval. Longitude increases towards the

East."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INSTR_BORESIGHT_MERCURY_X

COLUMN_NUMBER = 14

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65600

UNIT = Kilometers

DESCRIPTION = "Sub instrument boresight (x component) in Mercury fixed

coordinates at the middle of the collection interval."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INSTR_BORESIGHT_MERCURY_Y

COLUMN_NUMBER = 15

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65608

UNIT = Kilometers

DESCRIPTION = "Sub instrument boresight (y component) in Mercury fixed

coordinates at the middle of the collection interval."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INSTR_BORESIGHT_MERCURY_Z

COLUMN_NUMBER = 16

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65616

UNIT = Kilometers

DESCRIPTION = "Sub instrument boresight (z component) in Mercury fixed

coordinates at the middle of the collection interval."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = SCALT

COLUMN_NUMBER = 17

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65624

UNIT = Kilometers

DESCRIPTION = "Mercury centric altitude of the sub-spacecraft point

in Mercury-fixed rotating frame at the middle of the collection

interval."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = DELTA_ANGLE

COLUMN_NUMBER = 18

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65632

UNIT = DEGREE

DESCRIPTION = "Difference between instrument +y direction and true north

at the middle of the collection interval."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = MERCURY_SOL

COLUMN_NUMBER = 19

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65640

UNIT = DEGREE

DESCRIPTION = "Longitude of the Sun at 0 hours UT on the date of the

record. Taken from the Association of Lunar and Planetary Observers

'Ephemeris for Physical Observation of Mercury'."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LOCAL_HOUR

COLUMN_NUMBER = 20

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 65648

UNIT = Hours

DESCRIPTION = "Local Sun hour at the sub-spacecraft point."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = LOCAL_MINUTE

COLUMN_NUMBER = 21

BYTES = 1

DATA_TYPE = MSB_UNSIGNED_INTEGER

START_BYTE = 65649

UNIT = Minutes

DESCRIPTION = "Local Sun minute at the sub-spacecraft point."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = POINTING

COLUMN_NUMBER = 22

BYTES = 1

DATA_TYPE = BOOLEAN

START_BYTE = 65650

DESCRIPTION = "True if pointing data was available."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = INTERSECTING

COLUMN_NUMBER = 23

BYTES = 1

DATA_TYPE = BOOLEAN

START_BYTE = 65651

DESCRIPTION = "True if the pointing vector intersects Mercury."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = NADIR_ANGLE

COLUMN_NUMBER = 24

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65652

UNIT = DEGREE

DESCRIPTION = "Spacecraft attitude during orbits and flybys is

defined by two additional coordinate systems, the GRS LVLH

(Local Vertical Local Horizontal) frame and the spacecraft fixed

frame, and by the rotation of the spacecraft frame with respect

to the GRS LVLH frame. In the GRS LVLH frame, the Z axis is

aligned with the vector from the spacecraft to the planet center

(the nadir direction), the Y axis is the negative of the cross

product of the position and velocity vectors, and the X axis

points in the instantaneous direction of motion, completing a

right-handed coordinate system. The Z axis is along the viewing

direction of the instrument deck inside the adapter ring and of

the GRS just outside the adapter ring, the Y axis is directed from

the spacecraft along the magnetometer boom, and the X-axis is

parallel to the solar panel booms, forming a right-handed

coordinate system. The spacecraft attitude is specified by the

rotation of the spacecraft fixed frame Z axis in the GRS LVLH frame

and a twist angle about the Z axis. The Z axis rotation is given by

a nadir angle and an azimuth angle, where the nadir angle is 0

degrees when the spacecraft Z axis points along the + Z LVLH axis

and 180 degrees when it points along -Z in the LVLH frame, and the

LVLH azimuth angle is measured counterclockwise about the Z LVLH

axis from the X LVLH axis. The twist angle is measured positive

about the +Z spacecraft axis. See section 5.4.2 in the GRS_CDR_SIS

for further details."

END_OBJECT = COLUMN

OBJECT = COLUMN

NAME = AZIMUTH

COLUMN_NUMBER = 25

BYTES = 8

DATA_TYPE = IEEE_REAL

START_BYTE = 65660