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XMM­Newton CCF Release Note
XMM­CCF­REL­203
Long term EPIC­pn CTI correction refinement
M. Kirsch
April 5, 2006
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EPN CTI 0015 2000­01­01T00:00:00 LONG TERM CTI 3.172.5 NO
2 Changes
The EPIC­pn Extended Full Frame (eFF) mode showed an overcorrection with time for the on­
board calibration source at Mn energies. Corresponding parameters have been changed in the
EPN CTI 0015.CCF in the extension LONG TERM CTI.
The long term CTI parameters for all other modes except for extended Full Frame mode stay
the same as for Full Frame mode.
3 Scientific Impact of this Update
Line energy accuracy at Mn­K (Al­K) energies changes by up to 0.1 % for observations performed
at in late 2005 in the Extended Full Frame mode.
The change is less strong at earlier times in the mission.
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XMM­Newton CCF Release XMM­CCF­REL­203 Page: 2
Table 1: Residual e#ects on data.
FF Al­K FF Mn­K eFF Al­K eFF Mn­K
residual slope old 0.0009 0.0001 0.0014 0.0008
residual slope new 0.0009 0.0001 0.0010 0.0000
e#ect at rev. 1000 old [%] 0.29 0.01 0.46 0.07
e#ect at rev. 1000 new [%] 0.29 0.01 0.35 0.00
e#ect at rev. 1000 old [eV] 5 1 7 4
e#ect at rev. 1000 new [eV] 5 1 5 < 1
4 Estimated Scientific Quality
Line position measurements will be more accuracte for the Extended Full Frame mode through all
the mission.
5 Test procedures & results
All available CALCLOSED data have been reprocessed with the EPN CTI 0014.CCF and EPN CTI 0015.CCF
and Al and Mn line positions have been compared. Figure 1 shows the line positions of Al and Mn
for CCD4 with EPN CTI 0014.CCF and EPN CTI 0015.CCF.
The residual time slope has been fitted with a linear fit. The slopes and the residual e#ect on
data from revolution 1000 are shown in table 1.
6 Expected Updates
The long term CTI correction is currently the same for all modes but the Extended Full Frame
mode. We may introduce mode specific long term CTI correction also for the other modes. CCF
and software are prepared for that.

XMM­Newton CCF Release XMM­CCF­REL­203 Page: 3
Mn­K position FF old and new
200 400 600 800 1000
revolution
1160
1170
1180
1190
1200
energy
in
ADU
old
new nominal position
slope old 0.000126819
slope_new 0.000133674
res effect at rev 1000 (old) [%] 0.0107547
res effect at rev 1000 (new) [%] 0.0113360
Mn­K position EFF old and new
200 400 600 800 1000
revolution
1160
1170
1180
1190
1200
energy
in
ADU
old
new nominal position
slope old 0.000812673
slope_new 4.76744e­05
res effect at rev 1000 (old) [%] 0.0689173
res effect at rev 1000 (new) [%] 0.00404294
Al­K position FF old and new
200 400 600 800 1000
revolution
290
292
294
296
298
300
energy
in
ADU
old
new nominal position
slope old 0.000849492
slope_new 0.000849650
res effect at rev 1000 (old) [%] 0.285832
res effect at rev 1000 (new) [%] 0.285885
Al­K position EFF old and new
200 400 600 800 1000
revolution
290
292
294
296
298
300
energy
in
ADU
old
new nominal position
slope old 0.00136258
slope_new 0.00102638
res effect at rev 1000 (old) [%] 0.458472
res effect at rev 1000 (new) [%] 0.345350
Figure 1: Line positions of the internal calibration source eFF (right) mode for Mn­K(alpha)(upper)
and Al­K(lower). As a comparison the same plot is shown for FF (left). Black: EPN CTI 0014.CCF,
Red: EPN CTI 0015.CCF. Note that for Al the line position is not yet at the nominal value after CTI
correction only. This e#ect is taken into account in the detector response matrix with the Partial
Event E#ect, that is relatively stronger at low energies.