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XMM­Newton CCF Release Note
XMM­CCF­REL­19
OM BAD PIXEL
B. Chen
November 8, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
OM BADPIX 0002 2000­01­01T00:00:00 BADPIX Yes
2 Changes
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.
The file describes the redundant OM detector chain.
3 Scientific Impact of this Update
Almost all bad pixels found in the previous analysis are in the new list. 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.
1

XMM­Newton CCF Release XMM­CCF­REL­19 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).