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XMM­Newton CCF Release Note
XMM­CCF­REL­105
OM BAD PIXEL
Bing Chen
January 16, 2002
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
OM BADPIX 0004 2000­01­01T00:00:00 BADPIX Yes
2 Changes
The origin for OM badpixel coordinates is (1,1) and was incorrectly designed in the previous version
(version 3) as (0,0). This new CCF corrects this bug and is a replacement of the previous one
(OM BADPIX 0003). Others keep unchanged.
The CCF file badpix lists detector pixels which show a non­nominal behaviour. Currently the
areas showing edge emission (based on CSL data) and the bad pixels (based on inflight flatfields)
are included.
We expected the om badpix file to be updated, once more fullframe flats (with correct LED
setting) become available and are analysed.
3 Scientific Impact of this Update
We have constructed a composite flatfiled from observations between Rev. 130 and 340. Since our
data have a much higher S/N, some new bad pixels have been identified. This update will not affect
too much the scientific output.
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XMM­Newton CCF Release XMM­CCF­REL­105 Page: 2
4 Estimated Scientific Quality
The sensitivity values associated with the badpixel are suitable for a rough quality flag but probably
not yet good enough for accurate correction. The safe approach is to exclude the listed bad pixels
from the analysis.
5 Acknowledgements
Thanks to OM team members, especially Bob Shirey (UCSB).