Chandra Proposal Planning
The following links address known issues relating to the usage and accuracy of calibration data files included in the Chandra CalDB. These have been added on an ad-hoc basis, and are by no means exhaustive. More may be added at any time.
- 38 ACIS archival OBS_IDs with "problem reading tgainfile" from the CalDB
A problem for certain ACIS OBS_IDs whose duration crosses an ACIS T_GAIN epoch boundary. A simple fix to the problem is prescribed.
- ACIS Responses Suite version N0005
A discussion of the accuracy of the latest FI chip RMFs with mkacisrmf.
- Using the HRC-I RMF
Issues regarding the use of the HRC-I RMF version N0002 in Sherpa/XSPEC.
- ACIS T_GAIN FILE ERRORS
ACIS Epoch 42 (May-July 2010) T_GAIN file errors, in CalDB 4.4.1 and 4.4.2.