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XMM­Newton CCF Release Note
XMM­CCF­REL­32
EPIC Bad Pixels
D Lumb
October 31, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 BADPIX 0007 1999­01­01T00:00:00 BADPIX YES
EMOS2 BADPIX 0007 1999­01­01T00:00:00 BADPIX YES
2 Changes
It was discovered that for early operations, an incorrect set of up­linked bad pixel tables was used
on­board. This version of file was replaced so that identified bad pixels are logged as notuplinked,
and the correct set are identified as uplinked. This set was changed in May 2000, so the next release
note and file with new validity date will be used to cover this case.
3 Scientific Impact of this Update
Should correctly interpret what was uplinked to on­board bad pixels list.
4 Estimated Scientific Quality
The response generation tasks make a rudimentary correction for the consequent area losses, but
secondary effects of changing pattern types can occur (for example bi­pixel events become single
1

XMM­Newton CCF Release XMM­CCF­REL­32 Page: 2
pixel events). As long as a bad pixel does not occur at the peak of the PSF or extraction region,
the errors in correction will not be significant.
Bad pixels can seem to come and go. Thus for any observation the user needs to check what has
been produced by the standard processing in the way of identified new bad pixels.
5 Expected Updates
Whenever there is a new release of badpixels for on­board the CCF file will be updated. Not­
uplinked bad pixels which are found to be stable and should be placed in the file will be added as
necessary