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XMM­Newton CCF Release Note
XMM­CCF­REL­107
RGS GTI Selection
C. Gabriel
February 5, 2002
1 CCF components
Name of CCF VALDATE EVALDATE List of Blocks
changed
XSCS flag
RGS2 HKPARMINT 0010 2000­11­19T13:00:00 2001­02­17T10:00:00 HKPARMINT NO
2 Changes
The performance of the CCD2 of the RGS2 instrument was not satisfactory after almost all serial
clock voltages were changed at once in November 2000 (as decided after the failure of CCD7 on
RGS1). This led to several changes by that clock voltage in a period of time between November
2000 and February 2001. In order to restrict the number of calibration files related to this it was
decided just to ignore this parameter in the HKPARMINT file for that period in time.
3 Scientific Impact of this Update
The GTIs based on HK for data taken between 2000­11­18 and 2001­02­17 will not take into account
the serial clock voltage of RGS2­CCD2.
4 Estimated Scientific Quality
Not applicable.
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XMM­Newton CCF Release XMM­CCF­REL­107 Page: 2
5 Test procedures
General checks:
ffl use FV (or a different FITS viewer) for files inspection. It should contain 3 binary extensions,
check that the applied changes are correct in the corresponding header extension.
Check improvements:
Derive GTIs for data taken at different times using the SAS task HKGTIGEN. Check the GTIs
produced.
6 Test results
Following tests were performed:
ffl HKGTIGEN ran on RGS2 data taken in rev 185 adding RGS2 HKPARMINT 0010.CCF file
to the current ccf.cif. CCD2 clock voltage ignored as expected. GTIs produced are OK.
ffl CIFBUILD performed on data corresponding to rev 362 with a ccf directory containing both
RGS2 HKPARMINT 0008.CCF and RGS2 HKPARMINT 0010.CCF takes the first one on
the ccf index file, as it should be, according to the ''End of Validity'' keyword of the latter.
7 Expected updates
Not foreseen.