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XMM­Newton CCF Release Note
XMM­CCF­REL­9
EPIC TIMING
D LUMB
October 4, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 TIMECORR 0003 2000­01­01T00:00:00 FRAMETIME YES
EMOS2 TIMECORR 0003 2000­01­01T00:00:00 FRAMETIME YES
EPN TIMECORR 0004 2000­01­01T00:00:00 FRAMETIME
TIMECORR
YES
2 Changes
First Release
The time between detection of a photon in a CCD, and the time which is written into a time
stamp datum associated with a readout frame is partially indeterminate, but the mean time of the
frame is generally assigned to this detection. The TIMECORR files provide a means of correcting
for the mode­dependent readout delay.
The timings are derived at present from a knowledge of the ground measurements of clock timings
and sequences. The absolute timing are further dependent on spacecraft OBT to UTC corrections,
and these will dominate the error budget (TBC).
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XMM­Newton CCF Release XMM­CCF­REL­9 Page: 2
3 Scientific Impact of this Update
4 Estimated Scientific Quality
It5 is known taht in the phase resolved analysis of the Crab pulsar, and ABSOLUTE timing error
of 13ms \SigmaN\ThetaPERIOD was noted. The source of the error could be in barycentric correction, orbit
files or the EPIC pipeline processing.