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XMM-Newton CCF Release Note
XMM-CCF-REL-194
OM PSF - A correction
A. Talavera
September 15, 2005
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS ag
OM PSF1DRB 0010 PSF-UVW1 No
PSF-UVM2 No
PSF-UVW2 No
2 Changes
The OM PSF for the UV lters, (UVW1, UVM2, UVW2), was dened in Issue 0008 of this CCF
(see XMM-CCF-REL-160). Unfortunately there was an error in the values of the central points of
the PSF in all three lters. This has been corrected in this new issue.
3 Scientic Impact of this Update
Star count rates obtained with the current PSF CCF are slightly bigger than the ones derived by
using the new issue. Dierences are less than 3 % in all three lters and they are smaller for higher
count rates.
4 Estimated Scientic Quality
The eect of this correction to the current PSF denition is almost negligible since we have other
sources of error that are larger than this one. However, the dened PSF will be from now on formally
1

XMM-Newton CCF Release XMM-CCF-REL-194 Page: 2
correct.
5 Test procedures
The standard stars normally used in the OM photometric calibration have been reprocessed with
the new values of the PSF. Also another dense eld repeatedly used by OM has been reprocessed.
6 Summary of the tests results
The ratios of old count rates and new ones are (mean values) 1.4 % for UVW1 lter, 1.5 % for
UVM2 and 0.8 % for UVW2. They are less than 0.5 % at count rates higher than 10 counts/s.
7 Expected updates
PSF studies for the OM lenticular lters are completed. We do not expect any further update.