Dear Chandra Users,
There are 38 OBSIDs where manual reprocessing with chandra_repro fails
to include the ACIS Time-Dependent Gain (TGAIN) correction. Archival
reprocessing (Repro 4) is being modified to correct for this error, but
has not been completed for all of these OBS_IDs. Manual reprocessing by
users requires some extra care.
If you are analyzing any of the 38 OBSIDs in the attached PDF table
and listed at
http://cxc.cfa.harvard.edu/caldb4/caveats/acis_tgain_epoch_break.html#obsids
please read carefully the instructions on the page:
http://cxc.cfa.harvard.edu/caldb4/caveats/acis_tgain_epoch_break.html
A fix to the CalDB coming in version 4.5.0, anticipated for release in
May 2012, will eliminate this issue.
As always, please contact the CXC HelpDesk with any questions or for
further clarification.
Again, this information is *only* of interest to people analyzing any
of the 38 ObsIds listed below and at
http://cxc.cfa.harvard.edu/caldb4/caveats/acis_tgain_epoch_break.html#obsids
Thank you for your attention,
Dale Graessle
Chandra CalDB Manager
This archive was generated by hypermail 2b29 : Wed May 15 2013 - 01:00:13 EDT