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XMM­Newton CCF Release Note
XMM­CCF­REL­291
Modifications to EMOS Bad Pixel Table
M.J.S. Smith
August 8, 2012
1 CCF Components
Name of CCF VALDATE EVALDATE Blocks Changed CAL Version XSCS Flag
EMOS1 BADPIX 0034 2012­07­21T18:55:33 -- BADPIX NO
EMOS2 BADPIX 0026 2012­07­21T18:55:33 -- 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 will be
recognised and removed appropriately by the SAS. Nevertheless, persistent noisy pixels are flagged
on board through the Bright Pixel Table so as to reduce the MOS downlink telemetry load.
Some recently identified persistent noisy pixels have been included in the latest MOS Bright
Pixel Table which is in use from revolution 2311 onwards. In all, 18 new pixels (3 for MOS1, 15
for MOS2) have been added to the BPT, reducing count rates by 2% up to 24%, 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 XMM­CCF­REL­291 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 12.0.1).
Results as expected. In particular, no warnings issued of the type:
embadpixfind: warning (getCalBadpix10), Bright pixel at [...] [...]
is declared uplinked in the CCF but is present in the data.