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Last modified: 6 June 2024

URL: https://cxc.cfa.harvard.edu/caldb/downloads/Release_notes/CALDB_v4.11.2.html

CalDB 4.11.2 Public Release Notes

Public Release Date: 06 June 2024

SDP Installation Not Needed


I. INTRODUCTION

CalDB 4.11.2 is an upgrade to the Chandra CalDB, which includes the following items:

For the CIAO 4.16 / CalDB 4.11.2 release notes see How CalDB 4.11.2 Affects Your Analysis.

II. SUMMARY OF CHANGES

A. HRC-I QE version N0015 file set

Location: $CALDB/data/chandra/hrc/qe/
Filename: hrciD1999-07-29qeN0015.fits
hrciD2000-07-23qeN0015.fits
hrciD2001-04-17qeN0015.fits
hrciD2001-10-12qeN0015.fits
hrciD2002-04-12qeN0015.fits
hrciD2002-10-23qeN0015.fits
hrciD2003-04-23qeN0015.fits
hrciD2003-10-06qeN0015.fits
hrciD2004-04-05qeN0015.fits
hrciD2004-11-05qeN0015.fits
hrciD2005-05-15qeN0015.fits
hrciD2005-11-01qeN0015.fits
hrciD2006-04-25qeN0015.fits
hrciD2006-11-19qeN0015.fits
hrciD2007-09-15qeN0015.fits
hrciD2008-09-11qeN0015.fits
hrciD2009-09-15qeN0015.fits
hrciD2010-09-16qeN0015.fits
hrciD2011-09-29qeN0015.fits
hrciD2012-09-29qeN0015.fits
hrciD2013-10-03qeN0015.fits
hrciD2014-09-29qeN0015.fits
hrciD2015-08-05qeN0015.fits
hrciD2016-06-11qeN0015.fits
hrciD2017-02-16qeN0015.fits
hrciD2017-08-16qeN0015.fits
hrciD2018-02-12qeN0015.fits
hrciD2018-08-24qeN0015.fits
hrciD2019-02-27qeN0015.fits
hrciD2019-08-24qeN0015.fits
hrciD2020-02-20qeN0015.fits
hrciD2020-08-27qeN0015.fits
hrciD2021-01-09qeN0015.fits
hrciD2021-02-16qeN0015.fits
hrciD2021-04-05qeN0015.fits
hrciD2021-08-29qeN0015.fits
hrciD2022-09-04qeN0015.fits
hrciD2023-09-27qeN0015.fits

The HRC calibration team has generated an update (version 15) to the HRC-I time-dependent QE file set in CalDB. The new file set includes one additional file effective as of 2023-09-27T00:00:00 (UTC), thus modifying the effective QE for all observations taken subsequently.

This update includes data from the latest HZ 43 observation. The QE includes both intrinsic QE loss as well as a correction estimated as due to photons lost below the lower level discriminator due to gain drop. In this version the latter has been reassessed, and is modeled as a piecewise polynomial over different time periods, leading to adjustments by ~1-2% in the epochs since c.2019.

PIPELINES/TOOLS AFFECTED:

CIAO tools/scripts fluximage and mkgarf

THREADS AFFECTED:

HRC-I Exposure Map and Exposure-corrected Image
LETG/HRC-I Grating ARFs