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Last modified: 14 June 2010

URL: http://cxc.harvard.edu/caldb/downloads/Release_notes/CALDB_v4.2.2.html

CALDB 4.2.2 PUBLIC RELEASE NOTES

Public Release Date: 19 APR 2010


I. INTRODUCTION

CalDB 4.2.2 is a patch upgrade to CalDB 4.2.0 and 4.2.1 for use in CIAO 4.2 and later versions of the Chandra analysis software. This is an emergency upgrade includes the following corrections to CalDB 4.2.1:

  • CalDB header corrections for two ACIS T_GAIN files
  • Corrected ACIS-I1 Group E blank-sky background file.

II. SUMMARY OF CHANGES

A. ACIS T_GAIN file corrections

LOCATION: $CALDB/data/chandra/acis/t_gain
FILENAMES: acisD2009-08-01t_gainN0006.fits
acisD2009-11-01t_gain_biN0002.fits

Pipelines/Tools affected:

CIAO/SDP reprocessing tool acis_process_events.

Threads affected:

Reprocessing Data to Create a New Level 2 Event File

B. One corrected ACIS-I1 BKGRND "Blank Sky" file from Group E

LOCATION: $CALDB/data/chandra/acis/bkgrnd
FILENAME: ACIS-I in focal plane:
acis1iD2005-09-01bkgrnd_ctiN0001A.fits

The new file replaces a file released in CalDB 4.2.1 named acis1iD2005-09-01bkgrnd_ctiN0001.fits, which was created with an error in the column filter specification of dmcopy. The error resulted in delivering the file with only one column, instead of removing that column. The new N0001A file has the appropriate data. This new file is stored in a new ACIS BKGNRD TAR ball, and must be unpacked from there to complete the CalDB 4.2.2 upgrade. See the CalDB 4.2.2 download instructions page.

Pipelines/tools affected:

CIAO contributed tool acis_bkgrnd_lookup.

Threads affected:

"The ACIS 'Blank-sky' Background Files"


Last modified: 14 June 2010
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