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XMM­Newton CCF Release Note
XMM­CCF­REL­82
EPIC PN Energy Scale
M. Smith & D. Lumb
June 20, 2001
1 Changes
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 of several exposures, the uploaded offsets vary back and forth
between old and new database sets. Moreover, in order to cope with increased telemetry after a
number of very noisy pixels appeared in Rev. 156, several offset values had to be manually adjusted
in some subsequent revolutions. Other changes in uploaded offset values are due to commanding
errors (e.g. Rev. 199). All these variations were accounted for in the previous release, except for the
value of one single column offset (CCD 5, column 10) which did not reflect what had been actually
uploaded; this has been corrected in this release.
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 XMM­CCF­REL­82 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 0055 2000­01­01T00:00:00 OFFSET GAIN NO
EPN ADUCONV 0056 2000­06­11T03:00:00 OFFSET GAIN NO
EPN ADUCONV 0057 2000­06­29T02:49:00 OFFSET GAIN NO
EPN ADUCONV 0058 2000­07­01T08:07:00 OFFSET GAIN NO
EPN ADUCONV 0059 2000­07­03T12:00:00 OFFSET GAIN NO
EPN ADUCONV 0060 2000­07­03T22:16:00 OFFSET GAIN NO
EPN ADUCONV 0061 2000­07­05T15:00:00 OFFSET GAIN NO
EPN ADUCONV 0062 2000­07­05T22:30:00 OFFSET GAIN NO
EPN ADUCONV 0063 2000­07­07T15:54:00 OFFSET GAIN NO
EPN ADUCONV 0064 2000­07­08T11:50:00 OFFSET GAIN NO
EPN ADUCONV 0065 2000­07­10T03:16:00 OFFSET GAIN NO
EPN ADUCONV 0066 2000­07­10T17:00:00 OFFSET GAIN NO
EPN ADUCONV 0067 2000­07­13T12:16:00 OFFSET GAIN NO
EPN ADUCONV 0068 2000­07­26T04:58:00 OFFSET GAIN NO
EPN ADUCONV 0069 2000­07­28T04:32:46 OFFSET GAIN NO
EPN ADUCONV 0070 2000­07­29T00:59:00 OFFSET GAIN NO
EPN ADUCONV 0071 2000­08­02T00:22:00 OFFSET GAIN NO
EPN ADUCONV 0072 2000­08­02T20:19:00 OFFSET GAIN NO
EPN ADUCONV 0073 2000­08­04T11:42:00 OFFSET GAIN NO
EPN ADUCONV 0074 2000­08­04T20:11:00 OFFSET GAIN NO
EPN ADUCONV 0075 2000­08­07T00:58:00 OFFSET GAIN NO
EPN ADUCONV 0076 2000­08­10T10:00:00 OFFSET GAIN NO
EPN ADUCONV 0077 2000­10­31T23:00:00 OFFSET GAIN NO
EPN ADUCONV 0078 2000­11­03T21:38:00 OFFSET GAIN NO
EPN ADUCONV 0079 2000­11­05T16:00:00 OFFSET GAIN NO
EPN ADUCONV 0080 2000­11­05T21:31:00 OFFSET GAIN NO
EPN ADUCONV 0081 2000­11­07T16:00:00 OFFSET GAIN NO
EPN ADUCONV 0082 2000­11­07T21:22:00 OFFSET GAIN NO
EPN ADUCONV 0083 2000­12­13T20:48:00 OFFSET GAIN NO
EPN ADUCONV 0084 2000­12­14T11:07:00 OFFSET GAIN NO
EPN ADUCONV 0085 2000­12­15T14:02:00 OFFSET GAIN NO
EPN ADUCONV 0086 2000­12­15T16:56:00 OFFSET GAIN NO
EPN ADUCONV 0087 2000­12­19T14:05:00 OFFSET GAIN NO
EPN ADUCONV 0088 2000­12­19T16:41:00 OFFSET GAIN NO
EPN ADUCONV 0089 2000­12­21T14:19:00 OFFSET GAIN NO
EPN ADUCONV 0090 2000­12­21T16:39:00 OFFSET GAIN NO
EPN ADUCONV 0091 2000­12­25T13:18:00 OFFSET GAIN NO
EPN ADUCONV 0092 2001­01­08T12:47:00 OFFSET GAIN NO
EPN ADUCONV 0093 2001­01­08T15:53:00 OFFSET GAIN NO