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XMM­Newton CCF Release Note
XMM­CCF­REL­242
Modifications to EMOS Bad Pixel Table
M.J.S. Smith
April 1, 2008
1 CCF Components
Name of CCF VALDATE EVALDATE Blocks Changed CAL Version XSCS Flag
EMOS1 BADPIX 0033 2008­03­17T08:07:11 -- BADPIX NO
EMOS2 BADPIX 0025 2008­03­17T08:07:11 -- BADPIX NO
2 Changes
These CCFs reflect the currently uploaded MOS Bright Pixel Table.
Since the cooling of the MOS detectors in rev 533, there has been a slow but steady increase
in the number of noisy pixels. Noisy pixels do not provide scientifically useful data, and hence are
flagged on board so as to reduce the telemetry load.
The most persistent of the currently identified noisy pixels have been included in the most recent
MOS Bright Pixel Table which is in use from revolution 1515 onwards. In all, 16 new pixels (5 for
MOS1, 11 for MOS2) have been added to the BPT, reducing count rates by 5% to 15%, depending
on the CCD.
3 Scientific Impact of this Update
Minor, as in any case noisy pixels are recognised and flagged in the SAS data reduction (e.g. the
badpixfind task).
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XMM­Newton CCF Release XMM­CCF­REL­242 Page: 2
4 Estimated Scientific Quality
The CCFs correctly reflect the current status of uploaded bright pixels.
5 Expected Updates
Depending on further development of hot, noisy or dead pixels.
6 Test Procedures and Summary of the Test Results
. Verification of content with calview;
. Testing of correct functionality with emproc (SAS 7.1).
Results as expected.