Hello, Chandra Users:
CALDB 2.29 Released - 19 November 2004
As of 10:15 AM EST this morning, the Chandra CalDB version 2.29 is available
for download from the following CXC web page:
"Downloading CALDB 2.29"
++ Everything will be copied shortly on the European mirror site at:
CalDB 2.29 contains the following:
- Updates to the ACIS time-dependent gain for May 2004 (EPOCH 18)
and for August 2004 (EPOCH 19). Users are advised that
only those analyzing data acquired since March 2004, with
oxygen emission lines are likely to
see any significant differences in their scientific results.
However, any user may verify for him or herself the actual
affects of the updates by reprocessing their own data using CIAO
- Minor corrections to a single tile of ACIS-9 in the -120C gain
and FEF files, which have been incremented one version number.
Very few if any users will notice this change; it is more an
issue for the ACIS calibration team.
See the release notes and associated threads for details at
(Again the mirror site will soon have these updates as well, at
CalDB 2.29 has also been installed in the Chandra Processing CalDB at the CXC;
Users receiving ACIS data processed after 2004-11-18T21:45:00 will want to
upgrade their local CalDB areas before doing any reprocessing with
- Dale Graessle
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