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XMM­Newton CCF Release Note
XMM­CCF­REL­40
EPIC Energy Scale
D Lumb
November 8, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 ADUCONV 0009 2000­01­01T00:00:00 OFFSET GAIN NO
EMOS2 ADUCONV 0009 2000­01­01T00:00:00 OFFSET GAIN NO
2 Changes
Since launch, the MOS FAST modes have been operating with an incorrect number of clock cycles
for the amplifier sampling. As a result the gain is DIFFERENT than than that for other modes.
This needs to be treated coherently, as we know the PHA to PI correction is actually pattern type
dependent, and also non­linear. However we know this will be fixed in the next release of clock
sequences, so a permanent investigation and correction is not warranted or possible at this time.
Ad interim we have have examined a number of CLOSED CAL observations in the FAST UN­
COMP mode and determined a proportional gain shift for both cameras. This value is added as a
new keyword in the offset­gain extension, and used as a quick fix in the software in order to have
something available for the first public release of SAS.
3 Scientific Impact of this Update
Modifies the gain for the FAST mode of EPIC MOS
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XMM­Newton CCF Release XMM­CCF­REL­40 Page: 2
4 Estimated Scientific Quality
The gain change was estimated by using CAL CLOSED observations of the 3 internal emisison line
targets. We estimate that the gain in this mode is now much improved but still may be correct only
to ё1%
5 Expected Updates