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XMM-Newton CCF Release Note
XMM-CCF-REL-173
RGS DARKFRAME normalisation
A.M.T. Pollock
July 19, 2004
1 CCF components
Name of CCF VALDATE List of Blocks
changed
XSCS ag
RGS1 DARKFRAME 0005 1999-01-01T00:00:00 DARKFRAME NO
RGS2 DARKFRAME 0006 1999-01-01T00:00:00 DARKFRAME NO
2 Changes
The RGS DARKFRAME CCFs contain parameterisations of response non-uniformities across CCD
node surfaces. Two changes were necessary: RGS2 DARKFRAME 0004 did not contain the proper
CCD NODE ID designations C(0) and D(1) as all values were set to zero; and both the RGS1
and RGS2 CCFs did not have proper normalisation values a 3 and b 3 that should make the average
correction over the node zero. The dark frame is described with the equation
f = a 0  e a1 (rawX 1) + a 2  (rawX 1) + (a 3 + b 3 )=2 + b 0  e b1 (rawY 1) + b 2  (rawY 1)
In all DARKFRAME releases so far, both a 3 and b 3 have been incorrectly set to zero. Now, proper
values have been calculated per node to give 
f = 0 over 1  rawX  171, 1  rawY  128.
3 Scientic Impact of this Update
Though rigour has demanded these changes, there is very little eect on the processed data.
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XMM-Newton CCF Release XMM-CCF-REL-173 Page: 2
Figure 1: The upper panel shows the PHA distributions of RGS1 before (black) and after (red) and
RGS2 before (blue) and after(green) application of the new DARKFRAME CCFs. They are almost
identical. The small dierences between the two are shown in the lower panel for RGS1 (red) and
RGS2 (blue).
4 Estimated Scientic Quality
Eectively unchanged.
5 Test procedures & results
An example observation of HR1099 in 0495 0134540601 has been processed with rgsproc with and
without the new DARKFRAME CCFs. As expected, the changes are small. The upper part of
Fig. 1 shows the PHA distributions of the RGS1 and RGS2 cleaned events les before and after
application of the CCF revision. They are almost identical as emphasised by dierences plotted
beneath.

XMM-Newton CCF Release XMM-CCF-REL-173 Page: 3
6 Expected Updates
None.