urn:nasa:pds:odyssey_grs_cgs:data_science_derived:cgs_20090621_02_04 1.0 1.19.0.0 Product_Observational 2026-10-01 1.0 Migration to PDS4 2009-06-21T02:00:10.068Z 2009-06-21T03:59:46.272Z MARS Odyssey Mission urn:nasa:pds:context:investigation:mission.2001_mars_odyssey data_to_investigation 2001 MARS ODYSSEY Host urn:nasa:pds:context:instrument_host:spacecraft.ody is_instrument_host GAMMA RAY SPECTROMETER Instrument urn:nasa:pds:context:instrument:ody.grs is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target 0030 CORRECTED_GAMMA_SPECTRA 1.0 EXTENDED MISSION 238084415377 238086252488 cgs_20090621_02_04.dat cgs_data_table 2009-11-06T13:20:23.544 0 364 This is the corrected gamma ray spectra with associated data. 47 5 65935 SC_RECV_TIME 1 1 UnsignedMSB8 8 The time this packet was received by the spacecraft, in ticks (256 per second). SC_EV_TIME 2 9 UnsignedMSB8 8 Spacecraft time at the middle of the pixel, in ticks. CEB_TIME 3 17 UnsignedMSB8 8 ms Clock count from the GRS Common Electronics Box at the beginning of the pixel. UTC 4 25 ASCII_String 23 SC_EV_TIME converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss. PIXEL_DURATION 5 48 UnsignedMSB2 2 ms Length of the collection period in milliseconds. GRS_PIXEL_NUMBER 6 50 UnsignedMSB4 4 Sequential counter of accumulation intervals, starts with one as grs orbit begins. Special case on reboot when the the CEB is in orbit 0, pixel 0. 0 GRS_ORBIT_NUMBER 7 54 UnsignedMSB4 4 Sequential counter of orbits from GRS CEB boot. 0 ODY_ORBIT_NUMBER 8 58 UnsignedMSB4 4 Orbit number common to all instruments aboard Odyssey. This orbit number is incremented by one as the spacecraft passes through the orbital descending node. 0 AREOCENTRIC_LATITUDE 9 62 IEEE754MSBDouble 8 Sub spacecraft latitude in Mars fixed coordinates at the middle of the pixel. AREOCENTRIC_LONGITUDE 10 70 IEEE754MSBDouble 8 Sub spacecraft longitude in Mars fixed coordinates at the middle of the pixel. Longitude increases towards the East. 1 3 1 0 Sub instrument boresight (x,y,z) in Mars fixed coordinates at the middle of the pixel. 78 24 INSTR_BORESIGHT_MARS 1 1 IEEE754MSBDouble 8 km 2 3 1 0 Sub spacecraft vector (x,y,z) in Mars fixed coordinates at the middle of the pixel. 102 24 SUB_SCPOS_MARS 1 1 IEEE754MSBDouble 8 km SCALT 11 126 IEEE754MSBDouble 8 km Aerocentric altitude of the sub-spacecraft point in Mars-fixed rotating frame at the middle of the pixel. DELTA_ANGLE 12 134 IEEE754MSBDouble 8 degrees Difference between instrument +y direction and true north at the middle of the pixel. MARS_SOL 13 142 IEEE754MSBDouble 8 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 Mars'. DAY_INDEX 14 150 UnsignedMSB2 2 Day of Martian year. LOCAL_HOUR 15 152 UnsignedByte 1 Local Sun hour at the sub-spacecraft point. LOCAL_MINUTE 16 153 UnsignedByte 1 Local Sun minute at the sub-spacecraft point. POINTING 17 154 UnsignedByte 1 1 = True, if pointing data was available. INTERSECTING 18 155 UnsignedByte 1 1 = True, if the pointing vector intersects Mars. BAD_CODE 19 156 UnsignedMSB4 4 If non-zero, the data has been flagged bad. Definitions in bad_code.txt. IS_TEMP_A 20 160 IEEE754MSBSingle 4 celsius Inner Stage A temperature, smoothed and interpolated to the center of the pixel. IS_TEMP_B 21 164 IEEE754MSBSingle 4 celsius Inner Stage B temperature, smoothed and interpolated to the center of the pixel. OS_TEMP_A 22 168 IEEE754MSBSingle 4 celsius Outer Stage A temperature, smoothed and interpolated to the center of the pixel. OS_TEMP_B 23 172 IEEE754MSBSingle 4 celsius Outer Stage B temperature, smoothed and interpolated to the center of the pixel. B170K_TEMP 24 176 IEEE754MSBSingle 4 celsius The 170K card temperature, smoothed and interpolated to the center of the pixel. B170K_NORM_TEMP 25 180 IEEE754MSBSingle 4 celsius Temperature used to normalize the 170K card gain. IS_NORM_TEMP 26 184 IEEE754MSBSingle 4 celsius Temperature used to normalize the detector gain. GPA_TEMP 27 188 IEEE754MSBSingle 4 celsius Gamma Pulse Analyzer temperature, smoothed, and interpolated to the center of the pixel. GAMMA_VREF_TEMP 28 192 IEEE754MSBSingle 4 celsius V-reference temperature smoothed, and interpolated to the center of the pixel. HVBS_MONITOR 29 196 IEEE754MSBSingle 4 volts High voltage bias supply value smoothed, and interpolated to the center of the pixel. IS_TEMP_COEFFICIENT 30 200 IEEE754MSBSingle 4 Temperature coefficient of gain for the detector (parts-per-million/degree C) B170K_TEMP_COEFFICIENT 31 204 IEEE754MSBSingle 4 Temperature coefficient of gain for the 170K card (parts-per-million/degree C). APPS_GAIN_DHK 32 208 UnsignedMSB2 2 APPS shaping amp gain setting from gamma digital housekeeping. LLD_CNTR 33 210 UnsignedMSB2 2 Lower level discriminator count. ULD_CNTR 34 212 UnsignedMSB2 2 Upper level discriminator count. L1_CNTR 35 214 UnsignedMSB2 2 Total number of gamma events within the L1 energy range. L2_CNTR 36 216 UnsignedMSB2 2 Total number of gamma events within the L2 energy range. L3_CNTR 37 218 UnsignedMSB2 2 Total number of gamma events within the L3 energy range. PHA_CNTR 38 220 UnsignedMSB4 4 Pulse Height Analyzer counter. PHA_TIMER 39 224 UnsignedMSB8 8 Pulse Height Analyzer timer. FIRST_CHANNEL 40 232 UnsignedMSB2 2 First valid channel in the spectrum. LAST_CHANNEL 41 234 UnsignedMSB2 2 Last valid channel in the spectrum. FIRST_FULL_CHANNEL 42 236 UnsignedMSB2 2 First channel with real counts. LAST_FULL_CHANNEL 43 238 UnsignedMSB2 2 Last channel with real counts. GAIN 44 240 IEEE754MSBSingle 4 Target gain after correction, as determined by, as determined by instrument settings and spectral analysis. Units are KeV/channel. OFFSET 45 244 IEEE754MSBSingle 4 Target offset after correction, as determined by instrument settings and spectral analysis. Units are KeV. GAIN_CORRECTION 46 248 IEEE754MSBSingle 4 After summing the corrected spectra, we may find that due to aging, drift, etc. we did not correct to the target gain. This field is then set to the ratio of the actual to the target gain, and the spectrum is recorrected with this factor included. OFFSET_CORRECTION 47 252 IEEE754MSBSingle 4 Set to the ratio of the actual to the target offset. 3 3 1 0 Temperature coefficients for the GPA. 256 24 GPA_COEFFICIENTS 1 1 IEEE754MSBDouble 8 4 15 1 0 Coefficients of the polynomial used to correct the INL for this spectrum. Calculated from GAMMA_VREF_TEMP. 280 120 INL_COEFFICIENTS 1 1 IEEE754MSBDouble 8 5 16384 1 0 Gamma spectrum, corrected counts for each channel. 400 65536 CORRECTED_SPECTRUM 1 1 IEEE754MSBSingle 4 cgs_20090621_02_04.lbl 0 PDS3 PDS3 label Carriage-Return Line-Feed