CALDB Internal Release Notes Version: 2.20 CALDB Effective Date: 2002-12-13T13:00:00 SDP installation 2002-12-13T13:00:00 Released to the public Friday, Dec 13, 2002 (with the release of Cycle 5 Call for Proposals) I. Summary of Changes CALDB 2.20 specifically includes the PIMMS Cycle 5 Effective Area (EA) data files, including and limited to the following: $CALDB/data/chandra/acis/cpf/pimms/ acisiD2002-10-15pimmsN0005.fits acissD2002-10-15pimmsN0005.fits $CALDB/data/chandra/hrc/cpf/pimms/ hrciD2002-10-15pimmsN0005.fits hrcsD2002-10-15pimmsN0005.fits $CALDB/data/chandra/tel/grating/hetg/cpf/pimms/ acisihetg0D2002-10-15pimmsN0005.fits acissheg1D2002-10-15pimmsN0005.fits acisshegmeg1D2002-10-15pimmsN0005.fits acisshetg0D2002-10-15pimmsN0005.fits acissmeg1D2002-10-15pimmsN0005.fits $CALDB/data/chandra/tel/grating/letg/cpf/pimms/ acisiletg0D2002-10-15pimmsN0005.fits acissleg1D2002-10-15pimmsN0005.fits acissletg0D2002-10-15pimmsN0005.fits hrciletg0D2002-10-15pimmsN0005.fits hrcsleg1D2002-10-15pimmsN0005.fits hrcsleghiD2002-10-15pimmsN0005.fits hrcsletg0D2002-10-15pimmsN0005.fits The files beginning with "acis..." are indexed in the ACIS branch; those beginning with "hrc..." are indexed in the HRC branch. II. Technical Details CALDB files used to derive these effective areas are given on the web page http://cxc.harvard.edu/calco/prop_plan/pimms/pimms_cy05/PIMMS_EA_CY-4_5.html and illustrated on http://cxc.harvard.edu/calco/prop_plan/pimms/pimms_cy05/pimms_ao5_plots.html ACIS and ACIS/grating effective areas: The files are all ARFs derived from CIAO version 2.2.3 or 2.3 as necessary. In all cases, the ARFs were modified using the PSU slang script called acisabs_a05_sl, selecting the AVERAGE of the two contamination deposition models used (linear and exponential). This projects the time-dependent absorption in the OBF due to a hydrocarbon contaminant depositing there. The date used for the projection is 2004-05-15T00:00:00, or 1758 days after launch. This is expected to be the middle of the Cycle 5 observation period. HRC imaging ARFs: Calculated using CIAO 2.2.3 HRC-S/LETG GARFs: Used canned files in all cases here, available from the LETGS EA web page, located at: http://cxc.harvard.edu/cal/Letg/Hrc_QE/ea_index.html