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GSFC XMM-Newton GOF Status Report #253: XMM-NEWTON NEWS #148
_/ XMM-NEWTON NEWS #148 --- 09-May-2013 _/
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- Version 13.0 of the Science Analysis System (SAS) released
- Update on the MOS1-CCD3 event of December 2012
Version 13.0 of the Science Analysis System (SAS) released
The XMM-Newton SAS team is pleased to announce the release of a new
version of the SAS: SAS 13.0.
Binaries for diverse flavours of Linux and MacOs (both in 32- and
64-bit native versions) are available at:
The main improvements of this release can be summarised as follows:
* EPIC spectral products for a single source in multiple exposures: As
many sources have been observed by XMM-Newton in several occasions,
we have extended the use of "xmmselect" capabilities for handling
any number of exposures, including different EPIC cameras, even from
different observations. Selection of source and background region
in the combined image is possible, followed by an eventual
optimisation and extraction of source and background spectra from
everyone of the input exposures ("multiespecget"). Combined spectra
and response matrices can eventually be derived with the new task
* EPIC pn pile-up correction for imaging modes: A novel method ("Added
Event") for correcting the effects of pile-up is introduced
experimentally in this release. This method adds trial events to
the original event file and by following their evolution it
determines the fraction of upscattered events produced by pile-up
and their energies. The resultant channel spectrum is written into
* Off-axis astrometry refinement: An off-axis dependent systematic
offset in the EPIC astrometry can be corrected through
"poscorr3xmm". This effect is at most 0.5 arcsec for sources at an
off-axis angle of 12 arcmin.
* EPIC pn X-ray loading correction: Imaging modes can now be corrected
for X-ray loading through "epxrlcorr".
* RGS wavelength scale correction: The wavelength scale of the RGS
spectrometers can be corrected for its dependency with the distance
from the target to the Sun, through an upgrade of "rgsangles".
* RGS heliocentric correction: The heliocentric velocity correction,
introduced through "heliocentriccorr" in the previous SAS version,
can now be applied to the wavelength scale of the spectrum.
* the derivation of the RGS spectrum on a wavelength grid has been
improved, solving the problem of spikes in the spectrum in bins with
a very small effective area.
For further details please visit the SAS Pages at:
Update on the MOS1-CCD3 event of December 2012
The results of the final investigation of the 11 December 2012
MOS1-CCD3 event are now available:
* MOS1 CCD3 was significantly damaged, and it has been disabled.
* The science impact of the loss of MOS1 CCD3 is small (no impact for
on-axis point sources and extended sources with radius smaller than
* The frame-time of all the MOS1 CCDs in "Full Frame" mode and of the
peripheral CCDs in "Timing" mode has been modified from 2.6 to 2.7 s.
Please refer to the following Web page
for more details.
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