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XMM­Newton CCF Release Note
XMM­CCF­REL­90
EPIC PN Energy Scale
M. Smith
September 21, 2001
1 Changes
Changes consist of new offset values for three columns, related to the bad pixel table updates of
May and July 2001.
The offset values for selected columns are uploaded to the PN instrument at the same time as
bad pixel locations. These offsets correct for low level noisy columns, by artificially suppressing their
threshold values. However, in the ground processing this value must be added back in to obtain the
correct energy scaling.
Owing to manual commanding and changes in the time­line the uploaded column offset values
change back and forth between the old and new situation. This is reflected in the corresponding
CCFs.
2 Scientific Impact of this Update
For a limited set of columns ensures a correct energy conversion. However if the wrong file is used
it probably only affects a handful of columns at around a few eV level.
3 Estimated Scientific Quality
We expect that because the threshold of these columns was artificially raised, the actual detection
efficiencies will have been altered as well. Not yet accounted for.
1

XMM­Newton CCF Release XMM­CCF­REL­90 Page: 2
4 Expected Updates
With instrument database modifications, or due to future commanding errors.
5 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EPN ADUCONV 0094 2001­05­14T14:30:00 OFFSET GAIN NO
EPN ADUCONV 0095 2001­05­14T20:30:00 OFFSET GAIN NO
EPN ADUCONV 0096 2001­05­22T05:00:00 OFFSET GAIN NO
EPN ADUCONV 0097 2001­05­22T16:30:00 OFFSET GAIN NO
EPN ADUCONV 0098 2001­05­23T07:15:00 OFFSET GAIN NO
EPN ADUCONV 0099 2001­05­23T21:00:00 OFFSET GAIN NO
EPN ADUCONV 0100 2001­05­26T08:05:00 OFFSET GAIN NO
EPN ADUCONV 0101 2001­05­26T15:00:00 OFFSET GAIN NO
EPN ADUCONV 0102 2001­06­03T04:30:00 OFFSET GAIN NO
EPN ADUCONV 0103 2001­07­26T14:00:00 OFFSET GAIN NO
EPN ADUCONV 0104 2001­07­29T04:50:00 OFFSET GAIN NO
EPN ADUCONV 0105 2001­08­02T04:00:00 OFFSET GAIN NO
EPN ADUCONV 0106 2001­08­12T03:50:00 OFFSET GAIN NO
EPN ADUCONV 0107 2001­08­16T03:50:00 OFFSET GAIN NO