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XMM­Newton CCF Release Note
XMM­CCF­REL­97
EPIC PN TIMING
D LUMB
December 4, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EPN TIMECORR 0054 2000­01­01T00:00:00 FRAMETIME
TIMECORR
YES
2 Changes
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.
This update is based on a technical note provided by M Kuster and B Kretschmar of the Tubingen
group. It is entitled Correction of Photon Arrival Times for the Readout Modes of the EPIC­pn
Camera, dated Nov 21 2001.
3 Scientific Impact of this Update
4 Estimated Scientific Quality
Timing analysis also depends upon the quality of time correlation files in the ODFs. These are
being checked against radio ephemeris of Crab and other pulsars
1