PDS_VERSION_ID         = PDS3 

RECORD_TYPE            = STREAM
INSTRUMENT_HOST_NAME   = "2001 MARS ODYSSEY"
INSTRUMENT_NAME        = "GAMMA RAY SPECTROMETER"
TARGET_NAME            = MARS
OBJECT                 = TEXT
  PUBLICATION_DATE     = 2009-04-01
  NOTE                 = "Notes and errata for the Odyssey GRS AHD
                          archive" 
END_OBJECT             = TEXT
END 

April 1, 2009. Release 27.
--------------------------

This delivery covers data acquired between July 1 and September 30, 2008; 
however, the GRS instrument suite was turned off during this time. It was
turned on again on November 6, 2008. Only engineering and message EDR data
are available for this release. No derived data products were generated.

January 1, 2009. Release 26.
----------------------------

No data are available for June 5, 2008, due to a GRS safe mode event. No 
neutron spectrometer data are available for June 8-30, 2008, and no gamma
ray spectrometer or HEND data are available for June 9-30, 2008, due to a
GRS instrument reset event.

October 1, 2008. Release 25.
----------------------------

No errors or changes are reported with this release.

July 1, 2008. Release 24.
-------------------------

No errors or changes are reported with this release.

April 4, 2008. Release 23.
--------------------------

No errors or changes are reported with this release.

January 2, 2008. Release 22.
----------------------------

No errors or changes are reported with this release.

October 1, 2007. Release 21.
----------------------------

No errors or changes are reported with this release.

July 1, 2007. Release 20.
-------------------------

No errors or changes are reported with this release.

April 24, 2007. Release 19.
---------------------------

No errors or changes are reported with this release.

January 1, 2007. Release 18.
----------------------------

No errors or changes are reported with this release.

October 4, 2006. Release 17.
----------------------------

The file dataset.cat in the catalog directory has been revised.
The file references.txt in the document directory has been revised.

July 1, 2006. Release 16.
-------------------------

This release includes new Averaged HEND Data acquired between October 1, 2005,
and December 31, 2005, along with revisions of all previously-released AHD 
products acquired between March 1, 2002, and September 30, 2005. The DHD data 
from which these AHD data are derived were reprocessed to make corrections for 
background influenced by changes of Cosmic Gamma Ray flux as a function of 
solar cycle. The changes are described in the file grs_hend_processing.pdf 
in the document directory.

The file dataset.cat in the catalog directory has been revised.

The files grs_hend_processing.pdf, bad_data_timeline.txt, and references.txt
in the document directory have been revised.


April 3, 2006. Release 15.
--------------------------

No errors or changes are reported with this release.


January 1, 2006. Release 14.
----------------------------

Between April 3 and April 6, 2005, the Odyssey spacecraft was in
safe mode, so GRS data is missing for those dates. Solar events
on May 16-17 and June 17-18, 2005, were also responsible for some
data gaps. See the file bad_data_timeline.txt in the document directory 
for details of data gaps.

The files bad_data_timeline.txt and references.txt have been added to
the document directory, and the file time_conversion_tables.pdf has 
been updated.

October 1, 2005. Release 13.
----------------------------

There are no errors to report for this release.

July 1, 2005. Release 12.
-------------------------

There are no errors to report for this release.

April 25, 2005.
---------------

The file mission.cat in the catalog directory has been updated
to include a discussion of Odyssey Extended Mission 1.

April 1, 2005. Release 11.
--------------------------

There are no errors to report for this release.

January 1, 2005. Release 10.
----------------------------

The following files in the document directory have been revised:

   grs_hend_processing.pdf
   grs_hend_processing.lbl
   time_conversion_tables.pdf
   time_conversion_tables.lbl

October 1, 2004. Release 9.
---------------------------

There are no errors to report for this release.

July 1, 2004. Release 8.
------------------------

1. This is the first release of Odyssey Averaged HEND Data (AHD)
   products.