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XMM­Newton CCF Release Note
XMM­CCF­REL­69
CCF Release note
(Encircled Energy Function of the X­ray telescopes)
P. Gondoin
April 3, 2001
1 CCF components
Name of CCF VALDATE Blocks changed CAL VERSION XSCS flag
XRT1 XENCIREN 0001 2000­01­01T00:00:00 XENCIREN SAS 5.1 NO
XRT2 XENCIREN 0001 2000­01­01T00:00:00 XENCIREN SAS 5.1 NO
XRT3 XENCIREN 0001 2000­01­01T00:00:00 XENCIREN SAS 5.1 NO
2 Changes
The files describe the Encircled Energy Functions of the flight x­ray telescopes XRT1, XRT2 and
XRT3 vs energy. The XRT1, XRT2 and XRT3 telescopes are respectively associated with the MOS1,
MOS2 and PN EPIC cameras. Each file consists of a header and a table section. The table section
contains tables of coefficients which provide the on­axis enclosed energy as a function of the radius
in mm of a circular extraction window. These tables are provided for different energies. Parameters
provided in the header are used to extrapolate this tables to off­axis encircled energies values using
a calibration routine [1].
3 Scientific Impact of this Update
This note describes the first release of the encircled energy CCF files. The released tables are used
by the SAS to correct the EPIC response matrices from scattering losses of photons out of circular
windows selected by the users to extract the EPIC spectra of x­ray sources.
1

XMM­Newton CCF Release XMM­CCF­REL­69 Page: 2
4 Estimated Scientific Quality
The CCF files contains 6 tables of encircled energy functions which were generated using scisim
in combination with a numerical model of the x­ray telescopes [2]. In­orbit calibration verification
indicates that the in­orbit telescope PSFs are identical to the on­ground measurements [3] [4]
within the accuracy limit of background subtraction. Hence, the accuracy of the tables provided
in the CCF library can be estimated by comparison with on­ground calibration test measurements.
Figure 2 indicates that the tabulated encircled energy function on­axis at 1.5 keV, 4.5 and 8.0 keV
agrees with on­axis PANTER measurements of the 50% and 90% energy width to an accuracy better
than 3 % accuracy. Fig. 3 indicates that the parametrized off­axis encircled energy function agrees
with on­axis PANTER measurements of the 50% and 90% energy width to an accuracy better than
3 % accuracy.
0 30 60 90 120 150 180
arcsec
10 -5
10 -4
10 -3
10 -2
10 -1
10
Point Spread Function of XMM FM3 Telescope
In orbit (MOS1 w2+w3)
On ground (PANTER CCD)
0 30 60 90 120 150
arcsec
10 -5
10 -4
10 -3
10 -2
10 -1
10 0
RPSF
In orbit EPIC MOS 2
On ground Panter CCD
Figure 1: PSF of the XRT1 (left) and XRT2 (right) telescope measured with the MOS1 and MOS2
camera operating respectively in window and full frame mode. The radial energy distributions of
the PSFs measured in­orbit are identical to on­ground measurements within the accuracy limit of
background substraction.
References
[1] Christian Erd, Philippe Gondoin, David Lumb, Rudi Much, Uwe Lammers, and Giuseppe Va­
canti. Calibration Access and Data Handbook. XMM­PS­GM­20, issue 1.0, ESA/SSD, September
2000.
[2] Ph. Gondoin, B. Aschenbach, H. Brauninger, D. de Chambure, J.P. Colette, R. Egger, K. van
Katwijk, D. Lumb, A. Peacock, Y. Stockmann, J.P. Tock, and R. Willingale. Simulation of
the XMM Mirror Performance based on Metrology Data. In SPIE Proc., volume 2808, pages
390--401, 1996.
[3] Ph. Gondoin, B. Aschenbach, M. Beijersbergen, R. Egger, F. Jansen, Y. Stockman, and J.P.
Tock. Calibration of the first XMM flight mirror module: I. Image Quality. In SPIE Proc.,
volume 3444, page 290, 1998.

XMM­Newton CCF Release XMM­CCF­REL­69 Page: 3
[4] Ph. Gondoin, B. Aschenbach, C. Erd, D.Lumb, S. Majerowicz, D. Neumann, and J.L.Sauvageot.
In­orbit calibration of the XMM­Newton telescopes. In SPIE Proc., 2000.

XMM­Newton CCF Release XMM­CCF­REL­69 Page: 4
0 60 120 180 240
Diameter (arcsec)
0
0.2
0.4
0.6
0.8
1
Encircled energy function (XRT3/ FM2 / EPIC pn)
Parametrization 1.5 keV
Parametrization 4.5 keV
Parametrization 7.5 keV
Measurements 1.5 keV
Measurements 4.5 keV
Measurements 8.0 keV
Figure 2: On­axis encircled energy function of the XRT3 telescope (in front of the EPIC p\Gamman camera
for three different energies. The parametrized curves are compared with measurements of the 50%
and 90% energy width performed at the PANTER faility.
0 60 120
Diameter (arcsec)
0
0.2
0.4
0.6
0.8
1
Encircled energy function
(XRT3 / FM2 / EPIC pn 1.5 keV)
Parametrization on-axis
Parametrization 7 arcmin off-axis
Parametrization 14 arcmin off-axis
Measurements on-axis
Measurements 7 arcmin off-axis
Measurements 14 arcmin off-axis
Figure 3: Encircled energy function of the XRT3 telescope (in front of the EPIC p\Gamman camera for
three different off­axis angles. The parametrized curves are compared with measurements of the
50% and 90% energy width performed at the PANTER facility.