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XMM­Newton CCF Release Note
XMM­CCF­REL­67
EPIC Bad Pixels
D Lumb and M Smith
April 4, 2001
1 Changes
Two functional changes have been made to the CCF. The first consists of the explicit inclusion of a
mode dependence, because the TIMING and BURST modes in particular do not use the bad pixel
tables on­board. Secondly, a place­holder column ``N STAT IMP'' has been added. This is a proxy
for the brightness of a bad pixel, and is necessary because its charge level can affect the amount of
charge transfer loss seen in X­ray signal packets coming at a higher RAWY location in the same
column.
2 Scientific Impact of this Update
Necessary to track changes in bad pixel settings. There were database updates in June 2000 and
December 2000, to cover new bad pixel locations found during the CAL/PV phase and Routine
phase respectively. These should be uplinked at the start of each observation. However this was
not reflected in the the procedures for the start of unscheduled exposures, for example due to
commanding losses, timeline interruptions etc.. In such cases old or upcoming bad pixel tables were
used. The listings of such exposures have been collated and the different CCF versions propagated
to account for an appropriate validity date.
Note that the interrupted and subsequently resumed Mrk 1383 exposure in revolution 116 cannot
be accounted for in its entirety as different bad pixel tables were used in the two parts. Only the
first part is reflected correctly in the relevant CCF.
Also note that some CAL CLOSED exposures in revolutions 103, 187, 189 and 190 are not
accounted for. Additionally, from the database update that occurred at Rev 171­192, the CAL
CLOSED exposures actually have an offset of 50 applied to CCD11 Column 64 which is not consistent
with the CCF. This is left in as we have no tracking mechanism at this level of detail, and science
analysis of CLOSED CAL data will not be materially affected.
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3 Estimated Scientific Quality
Note that in all the EPIC cameras there are intermittent bad pixels that may arise in only one
exposure. The user is recommended to run the bad pixel finding algorithm, and remove after
processing.
4 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EPN BADPIX 0054 1999­12­10T06:30:00 BADPIX NO
EPN BADPIX 0060 2000­06­29T02:00:00 BADPIX NO
EPN BADPIX 0062 2000­07­13T21:37:00 BADPIX NO
EPN BADPIX 0063 2000­07­25T00:45:00 BADPIX NO
EPN BADPIX 0064 2000­07­25T05:50:00 BADPIX NO
EPN BADPIX 0065 2000­07­26T04:48:00 BADPIX NO
EPN BADPIX 0066 2000­08­14T01:00:00 BADPIX NO
EPN BADPIX 0067 2000­10­21T00:00:00 BADPIX NO
EPN BADPIX 0068 2000­10­25T15:00:00 BADPIX NO
EPN BADPIX 0069 2000­10­31T23:00:00 BADPIX NO
EPN BADPIX 0070 2000­11­03T21:00:00 BADPIX NO
EPN BADPIX 0071 2000­11­09T16:00:00 BADPIX NO
EPN BADPIX 0072 2000­12­13T20:00:00 BADPIX NO
EPN BADPIX 0073 2000­12­14T11:00:00 BADPIX NO
EPN BADPIX 0074 2000­12­25T13:00:00 BADPIX NO