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XMM­Newton CCF Release Note
XMM­CCF­REL­198
PN Spatial Gain
M.J.S. Smith
October 14, 2005
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XMM­Newton CCF Release XMM­CCF­REL­198 Page: 2
1 CCF Components
Name of CCF VALDATE EVALDATE Blocks Changed XSCS Flag
EPN ADUCONV 0108.CCF 2000­01­01T00:00:00 2000­08­10T10:00:00 GAIN­HIGH NO
EPN ADUCONV 0109.CCF 2000­06­11T03:00:00 2000­06­29T02:49:00 GAIN­HIGH NO
EPN ADUCONV 0110.CCF 2000­07­01T08:07:00 2000­07­03T12:00:00 GAIN­HIGH NO
EPN ADUCONV 0111.CCF 2000­07­03T22:16:00 2000­07­05T15:00:00 GAIN­HIGH NO
EPN ADUCONV 0112.CCF 2000­07­05T22:30:00 2000­07­07T15:54:00 GAIN­HIGH NO
EPN ADUCONV 0113.CCF 2000­07­08T11:50:00 2000­07­10T03:16:00 GAIN­HIGH NO
EPN ADUCONV 0114.CCF 2000­07­10T17:00:00 2000­07­13T12:16:00 GAIN­HIGH NO
EPN ADUCONV 0115.CCF 2000­07­26T04:58:00 2000­07­28T04:32:46 GAIN­HIGH NO
EPN ADUCONV 0116.CCF 2000­07­29T00:59:00 2000­08­02T00:22:00 GAIN­HIGH NO
EPN ADUCONV 0117.CCF 2000­08­02T20:19:00 2000­08­04T11:42:00 GAIN­HIGH NO
EPN ADUCONV 0118.CCF 2000­08­04T20:11:00 2000­08­07T00:58:00 GAIN­HIGH NO
EPN ADUCONV 0119.CCF 2000­08­10T10:00:00 2000­10­31T23:00:00 GAIN­HIGH NO
EPN ADUCONV 0120.CCF 2000­10­31T23:00:00 2000­11­07T21:22:00 GAIN­HIGH NO
EPN ADUCONV 0121.CCF 2000­11­03T21:38:00 2000­11­05T16:00:00 GAIN­HIGH NO
EPN ADUCONV 0122.CCF 2000­11­05T21:31:00 2000­11­07T16:00:00 GAIN­HIGH NO
EPN ADUCONV 0123.CCF 2000­11­07T21:22:00 2000­12­13T20:48:00 GAIN­HIGH NO
EPN ADUCONV 0124.CCF 2000­12­13T20:48:00 2000­12­14T11:07:00 GAIN­HIGH NO
EPN ADUCONV 0125.CCF 2000­12­14T11:07:00 2000­12­15T14:02:00 GAIN­HIGH NO
EPN ADUCONV 0126.CCF 2000­12­15T14:02:00 2001­06­03T04:30:00 GAIN­HIGH NO
EPN ADUCONV 0127.CCF 2000­12­15T16:56:00 2000­12­19T14:05:00 GAIN­HIGH NO
EPN ADUCONV 0128.CCF 2000­12­19T16:41:00 2000­12­21T14:19:00 GAIN­HIGH NO
EPN ADUCONV 0129.CCF 2000­12­21T16:39:00 2000­12­25T13:18:00 GAIN­HIGH NO
EPN ADUCONV 0130.CCF 2001­01­08T12:47:00 2001­01­08T15:53:00 GAIN­HIGH NO
EPN ADUCONV 0131.CCF 2001­05­14T14:30:00 2001­05­14T20:30:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0132.CCF 2001­05­22T05:00:00 2001­05­22T16:30:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0133.CCF 2001­05­23T07:15:00 2001­05­23T21:00:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0134.CCF 2001­05­26T08:05:00 2001­05­26T15:00:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0135.CCF 2001­06­03T04:30:00 2001­07­26T14:00:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0136.CCF 2001­07­26T14:00:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0137.CCF 2001­07­29T04:50:00 2001­08­02T04:00:00 GAIN­HIGH, NO
OFFSET GAIN
EPN ADUCONV 0138.CCF 2001­08­12T03:50:00 2001­08­16T03:50:00 GAIN­HIGH, NO
OFFSET GAIN
2 Changes
A parameter of the gain model code has been updated in order significantly to improve the homo­
geneity of the PN (at least at higher energies). The 768 old values in the 7 th row of the GAIN­HIGH
extensions have been multiplied by 768 correction factors. These factors were derived by K. Dennerl
(MPE) from the ratio of the measured centroids of the Mn­K# line of each CCD column and its
nominal value. The same gain model parameters are in use throughout the mission, and thus the
GAIN­HIGH blocks are identical in all issues of this new release of EPN ADUCONV CCFs.

XMM­Newton CCF Release XMM­CCF­REL­198 Page: 3
Besides this change in gain model parameters, two modifications to the CCFs have been made
possible due to the use of keywords which were not yet implemented at the time of release of the
old CCF issues:
1. The large number of EPN ADUCONV CCFs covering the mission is due to the changes in
uploaded fixed o#set tables as reflected in the OFFSET GAIN block (see e.g. [1]). These changes
mainly occurred in periods of switching to­and­fro between pairs of fixed o#set table versions
due to manual commanding and re­planning of observations. The use of the EVALDATE keyword
makes it possible to define both the start and end of validity of a particular CCF (see [2]),
thus allowing in the case of the EPN ADUCONV CCFs a substantial reduction of the number
of issues covering the mission.
2. Where applicable, the BPT CODE keyword value has been added to the OFFSET GAIN extension.
This allows the SAS to check whether the correct o#set table is being used for a given obser­
vation by comparing certain housekeeping parameters in the PAH.fits file with the associated
BPT CODE value. Details may be found in [3].
3 Scientific Impact and Estimated Scientific Quality
The improvement in overall homogeneity of the PN energy scale at higher energies is illustrated in
Figures 1 and 2, where results with the old and new gain model parameters are compared at Mn­K#.
4 Test Procedures and Results
The correct functionality of the CCFs was verified with epproc and epchain on several observations
(SAS version 6.5.0). As an additional check that the gain parameters are correctly included in the
new issues, the column­wise energy scale at Mn­K# was analysed for observation 0094800301 (Rev
0281, Full Frame CalClosed), with results as expected.
The cifbuild task was used to check the correct VALDATE and EVALDATE values. This was done by
creating two CIFs for each period in which a particular o#set table was in use, one from the set of
old CCFs and one from the set of old and new CCFs. For each of these periods it was then verified
that the EPN ADUCONV CCF CIF members contain an identical OFFSET GAIN table.
References
[1] XMM­CCF­REL­90, XMM­Newton CCF Release Note, EPIC PN Energy Scale
[2] XMM­SAS cifbuild documentation at http://xmm.vilspa.esa.es/sas/current/doc/cifbuild/index.html
[3] XMM­Newton Calibration Access and Data Handbook, XMM­PS­GM­20, Issue 3.1, section 4.3.2.

XMM­Newton CCF Release XMM­CCF­REL­198 Page: 4
Figure 1: Column­wise mean values of the line centroids at Mn­K# for all CCDs (Full Frame
CalClosed, revolution 80). Left shows the results with the old CCFs, right shows the results with
the improved gain model parameters. There is a significant improvement in the overall homogeneity.
Plots provided by K. Dennerl (MPE).

XMM­Newton CCF Release XMM­CCF­REL­198 Page: 5
Figure 2: Image depicting the column­wise mean of the line centroids at Mn­K# for all CCDs (Full
Frame CalClosed, revolution 80). The colour coding is shown at top, with energies in keV. Left shows
the results of the old CCFs, right shows the results with the improved gain model parameters. The
improvement in the overall homogeneity is clearly evidenced by the narrower distribution of line
centroids. Plots provided by K. Dennerl (MPE).