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SAS watchout page


Should I update my CCF now that I do have installed SAS 10.0?

Definitively YES. Those of you not using synchronisation ("rsync" or "mirror") for updating continuously the calibration files needed by SAS, should take into account that SAS 10.0 needs several new files for processing correctly XMM-Newton data, eg.:
- the newer RGS*_TEMPLATEBCKGND_xxxx.CCF - for RGS background modelling in the wavelength grid regime (now the default)
- XMM_SPECQUAL_0002.CCF - for making use of the new task specgroup
- XRT[1][2][3]_XPSF_0011.CCF - for making use of the non-default 2D PSF modelling
- RGS[1][2]_EFFAREACORR_0006.CCF - for the updated RGS contamination modelling and also containing an extra extension for future use of the RGS rectification procedure, modifying the RGS effective area, should this be set to different values than unity.
The latest files in the former list contain a large number of epochs for coping with the temporal variation of the contamination, while SAS 9 was (by mistake) limited to work with 4 epochs by this correction. As a result the only way to keep properly working with SAS 9 is avoiding a CCF calibration update. This can have as consequence a miscalibration of RGS data, especially the one corresponding to the last 2 years. To avoid a possible mismatch between SAS version and calibration files (most of you update the CCF automatically through rsync) we will delay the release of the RGS[1][2]_EFFAREACORR_0006.CCF calibration files for a week after the SAS 10 release.
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This page was last updated on 12 December, 2013.