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XMM­Newton CCF Release Note
XMM­CCF­REL­68
RGS Offset Values as a Function of Time
C. Erd
April 2, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
RGS1 ADUCONV 0006 2000­02­06T12:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS2 ADUCONV 0007 2000­02­06T12:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS1 ADUCONV 0007 2000­07­09T01:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS2 ADUCONV 0008 2000­07­09T01:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS1 ADUCONV 0008 2000­07­23T15:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS2 ADUCONV 0009 2000­07­23T15:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS1 ADUCONV 0009 2000­09­12T19:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS2 ADUCONV 0010 2000­09­12T19:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS1 ADUCONV 0010 2000­11­11T15:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS2 ADUCONV 0011 2000­11­11T15:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
RGS2 ADUCONV 0012 2000­12­25T12:00:00 OFFSET GAIN xmmsas 20010403 1900 NO
2 Changes
The offset of the PHA conversion was changed from a constant value in time, to a parameterization,
depending on observation date (OBS START). Therefore the OFFSET column was replaced by the
columns OFFSET CONST and OFFSET SLOPE and the attribute REFTIME was added. See [1, version
2.1] for a description of the functionality.
ALGOID = 1.
The analysis is described in [2].
1

XMM­Newton CCF Release XMM­CCF­REL­68 Page: 2
3 Scientific Impact of this Update
The offset is used for the calculation of the PI values, which brings all CCD energy (through charge)
measurements onto the same scale. The PI value is subsequently used for the order selection of the
data, hence it influences the effective area.
Since the changes are only minor in PHA channels, the impact is too small to be measurable.
The slopes of the offset parameterization of the last period of validity were set = 0 in order to
avoid incorrect results in the course of time.
4 Estimated Scientific Quality
The changes correspond to the following operational changes/effects on the instruments:
ffl a large solar flare in revolution 109
ffl due to a failure on the electronics of RGS1 CCD7, operations were suspended during revolu­
tions 136--147
ffl the biases of all CCD's were lowered at the start of revolution 168, which also coincided with
the first operations following another large solar flare
ffl at the start of revolution 192 the bias of RGS2 CCD2 was brought back to its original value
The measured offset values are shown in Figures 1--4 as a function of revolution number. The
major events, which are listed above, are indicated by vertical dashed lines. The parameterizations
are overlay­ed by red lines, per period.
References
[1] Christian Erd, Phillipe Gondoin, David Lumb, Rudi Much, Uwe Lammers, and Giuseppe Va­
canti. Calibration Access and Data Handbook. XMM­PS­GM­20, issue 2.1, ESA/SSD, April
2001. http://xmm.vilspa.esa.es/calibration/docs/general/calhb.ps.gz.
[2] C. Gabriel. XMM­Newton: RGS Diagnostic Trend Analysis Report. XMM­SOC­INST­TN­0001,
issue 2.0, XMM­Newton SOC, February 2001.

XMM­Newton CCF Release XMM­CCF­REL­68 Page: 3
95
100
50 100 150 200
90
95
100
50 100 150 200
100
105
50 100 150 200
96
98
100
102
104
50 100 150 200
100
105
110
50 100 150 200
97
99
101
103
105
50 100 150 200
95
97
99
101
103
25 50 75 100 125
100
105
50 100 150 200
RGS1, Node C
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1 CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3 CCD 4
CCD 4
CCD 4
CCD 4
CCD 4
CCD 4
CCD 5
CCD 5
CCD 5
CCD 5
CCD 5
CCD 5 CCD 6
CCD 6
CCD 6
CCD 6
CCD 6
CCD 6
CCD 7
CCD 7
CCD 7
CCD 7
CCD 7 CCD 8
CCD 8
CCD 8
CCD 8
CCD 8
CCD 8
CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
110
115
50 100 150 200
Figure 1: Offset values versus revolution number for RGS1, all CCD's nodes C

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110
115
50 100 150 200
120
125
50 100 150 200
115
120
50 100 150 200
115
120
125
50 100 150 200
115
120
50 100 150 200
115
120
50 100 150 200
130
135
25 50 75 100 125
120
125
50 100 150 200
RGS1, Node D
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1 CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3 CCD 4
CCD 4
CCD 4
CCD 4
CCD 4
CCD 4
CCD 5
CCD 5
CCD 5
CCD 5
CCD 5
CCD 5 CCD 6
CCD 6
CCD 6
CCD 6
CCD 6
CCD 6
CCD 7
CCD 7
CCD 7
CCD 7
CCD 7 CCD 8
CCD 8
CCD 8
CCD 8
CCD 8
CCD 8
CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
125
130
50 100 150 200
Figure 2: Offset values versus revolution number for RGS1, all CCD's nodes D.

XMM­Newton CCF Release XMM­CCF­REL­68 Page: 5
112
114
116
118
120
50 100 150 200
105
107.5
110
112.5
115
50 100 150 200
114
116
118
120
122
50 100 150 200
117.5
120
122.5
125
127.5
50 100 150 200
115
117.5
120
122.5
125
50 100 150 200
107.5
110
112.5
115
117.5
50 100 150 200
110
115
50 100 150 200
RGS2, Node C
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1 CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3 CCD 5
CCD 5
CCD 5
CCD 5
CCD 5
CCD 5
CCD 6
CCD 6
CCD 6
CCD 6
CCD 6
CCD 6 CCD 7
CCD 7
CCD 7
CCD 7
CCD 7
CCD 7
CCD 8
CCD 8
CCD 8
CCD 8
CCD 8
CCD 8 CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
126
128
130
132
134
50 100 150 200
Figure 3: Offset values versus revolution number for RGS2, all CCD's nodes C.

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104
106
108
110
112
50 100 150 200
110
112.5
115
117.5
120
50 100 150 200
106
108
110
112
114
50 100 150 200
130
135
140
145
50 100 150 200
111
113
115
117
119
50 100 150 200
120
122.5
125
127.5
130
50 100 150 200
125
130
135
50 100 150 200
RGS2, Node D
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1
CCD 1 CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 2
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3
CCD 3 CCD 5
CCD 5
CCD 5
CCD 5
CCD 5
CCD 5
CCD 6
CCD 6
CCD 6
CCD 6
CCD 6
CCD 6 CCD 7
CCD 7
CCD 7
CCD 7
CCD 7
CCD 7
CCD 8
CCD 8
CCD 8
CCD 8
CCD 8
CCD 8 CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
CCD 9
118
120
122
124
126
128
50 100 150 200
Figure 4: Offset values versus revolution number for RGS2, all CCD's nodes D.