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: http://xmm.vilspa.esa.es/sas/7.0.0/documentation/threads/MOS_blank_fields.html
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In order to cope with this situation, blank sky event lists can be downloaded from the XMM-Newton Science Operations Center web site. This thread briefly explain how to use them.
This thread does not deal with the rather complex problem of a careful determination of the background normalization appropriate for a given observation. Users are referred to the EPIC background analysis web pages for more information.
evselect table=MOSclean.fits imagebinning=binSize imageset=MOSimage.fits withimageset=yes \ xcolumn=DETX ycolumn=DETY ximagebinsize=80 yimagebinsize=80
imgdisplay withimagefile=true imagefile=MOSimage.fits
evselect table=MOSclean.fits withspectrumset=yes spectrumset=MOSsource_spectrum.fits \ energycolumn=PI spectralbinsize=15 withspecranges=yes specchannelmin=0 specchannelmax=11999 \ expression='#XMMEA_EM && (PATTERN<=12) && ((DETX,DETY) IN circle(100,-100,640))'
evselect table=MOSbackground.ds withspectrumset=yes spectrumset=MOSbackground_spectrum.fits \ energycolumn=PI spectralbinsize=15 withspecranges=yes specchannelmin=0 specchannelmax=11999 \ expression='#XMMEA_EM && (PATTERN<=12) && ((DETX,DETY) IN circle(100,100,640))'
attcalc eventset=MOSbackground.ds attitudelabel=fixed withatthkset=N refpointlabl=user nominalra=... nominaldec=...
[MOS_spectrum_thread.html, v 2.0] | [Last update: 26-May-2006 by Matteo Guainazzi] |