CALDB RELEASE NOTES Version: 2.7 CALDB Effective Date: 2001-08-07T18:00:00 (1:59pm EDT) I. Summary of Changes A. New ACIS-S3 (BI) responses: Files: In $CALDB/data/chandra/acis/cpf/fefs/ acisD2000-01-29fef_phaN0002.fits acisD2000-01-29fef_piN0002.fits Only the data for ACIS-S3 (ACIS-7) have changed at all. See the CIAO threads page under http://cxc.harvard.edu/ciao/index.html for the thread for making ACIS BI RMFs for details on the use of these. B. Gain table upgrades corresponding to these new FEFs: Files: In $CALDB/data/chandra/acis/bcf/gain/ acisD2000-01-29gainN0003.fits acisD2000-07-04gainN0003.fits acisD2000-07-06gainN0003.fits acisD2000-08-12gainN0003.fits All values in the new gain files have been reconstructed, including all chips. However, the gains for the chips other than ACIS-7 are essentially identical to those previously released in version N0002. The new ACIS-7 gains require an upgrade to "acis_process_events" in order to use them properly in analysis. Hence a patch to CIAO is coordinated with CALDB 2.7. CIAO 2.1.3 is being released with this change and other upgrades, simultaneously with CALDB 2.7 on 07 August 2000. The multiplicity of these new files is due to focal plane temperature changes made programmatically during summer of 2000. All four of these files contain the same gain data. The CIAO threads page includes an updated thread for correcting ACIS gains for the use of these files.