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GSFC XMM-Newton GOF Status Report #266: XMM-NEWTON NEWS #158
XMM-NEWTON NEWS #158 --- 12-Dec-2013
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- Version 13.5.0 of the Science Analysis System (SAS) released
- Updated EPIC Timing Mode Calibrations
Version 13.5.0 of the Science Analysis System (SAS) released
An intermediate version of SAS, v13.5.0, has been released. The main
improvements of this release are related to upgrades in the
calibration of the EPIC cameras:
- EPIC-MOS contamination correction
Part of the temporal evolution of the soft X-ray EPIC-MOS response can
be explained as due to an increasing layer of a contaminant, similar
to what has been observed with the RGS detectors. Modelling of this
contaminant as a pure Carbon layer has been implemented through a new
calibration file, EMOS[1-2]_CONTAMINATION.CCF. The introduction of
these files implies an upgrade of the redistribution, as well as a
time-independent tuning of the quantum efficiency.
- EPIC-pn Timing mode energy scale refinement
A new method (RDPHA) for correcting the energy scale in PN Timing Mode
is offered as a non-default alternative through the parameter
'withrdpha' in 'epevents' (note that the parameter 'runepreject' must
al so be set to 'yes' for this correction to apply). This algorithm is
expected to eventually replace the current Rate-Dependent CTI (RDCTI)
correction. As of SASv13.5.0, the RDCTI correction is applied by the
matatasks 'epchain' and 'epproc' through the parameter 'runepfast'
('yes' by default).
A problem leading to the potential appearance of outliers in RGS
spectra when applying the heliocentric and/or the solar angle
correction to the wavelength scale has been solved. In addition, many
other less important improvements and small bug fixes have taken
As usually, SAS is distributed in binary form for several MacOs and
Linux flavours, the latter both in 32-bit and 64-bit versions.
Distribution of SAS in 32-bit binary versions for future releases is
under evaluation and may be discontinued in one or two years time.
For more information and to download the software, please go to:
Updated EPIC Timing Mode Calibrations
Two new CCF constituents were made public which have an impact on the
energy scale in EPIC-pn Timing Mode exposures:
EPN_REJECT_0007.CCF implements the correction for X-ray Loading (XRL),
EPN_CTI_0030.CCF updates accordingly the Rate-Dependent CTI (RDCTI)
correction and implements the new RDPHA method as a non-default
alternative (see the previous item).
Users are referred to the following documents for full details:
- XRL: http://xmm2.esac.esa.int/docs/documents/CAL-SRN-0302-1-5.pdf
- RDCTI: http://xmm2.esac.esa.int/docs/documents/CAL-SRN-0304-1-1.pdf
- RDPHA: http://xmm2.esac.esa.int/docs/documents/CAL-SRN-0306-1-1.pdf
- Expected quality of the energy reconstruction:
The aforementioned changes have no effect on exposures in Burst Mode,
or in imaging modes.
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