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XMM­Newton CCF Release Note
XMM­CCF­REL­30
EPIC Energy Scale
D Lumb
October 31, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 DARKFRAME 0005.CCF 1998­01­01T00:00:00 DARKFAME CCDn
OFFSET CCDn
­ NO
EMOS2 DARKFRAME 0005.CCF 1998­01­01T00:00:00 DARKFAME CCDn
OFFSET CCDn
­ NO
2 Changes
The energy scale of MOS data also depends of the offset in ADU's for zero X­ray energy input. It
has been found that calculating these offsets for each observation is a very lengthy process, reducing
observation efficiency. Detailed analysis showed, that except for localised areas around bright stars,
the offset values were very stable. The bright star locations are in any case not correctly calculated
due to the row/column averaging algorithm. Therefore we now adopt FIXED offset tables, and
these have been included in the CCF data set for reference.
3 Scientific Impact of this Update
First release
1

XMM­Newton CCF Release XMM­CCF­REL­30 Page: 2
4 Estimated Scientific Quality
The offset data files were averaged over MANY observations, and provide our best knowledge of
CCD bias frame values. Individual observations may have incorrect local offsets around bright stars.