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: http://xmm.vilspa.esa.es/sas/8.0.0/doc/epiclccorr/node7.html
Дата изменения: Wed Oct 22 16:50:15 2008 Дата индексирования: Fri Oct 16 22:20:39 2009 Кодировка: Поисковые слова: edge-on galaxy |
epiclccorr will treat all these corrections individually, developing and designing specific algorithms to correct the Relative Corrections.
GTIs correction will be calculated using the GTI extensions located in
the time series file, if any. Otherwise, the STDGTI will be used to
calculate the GTIs corrections. Collection regions overlapping more
than one ccd will be treated using the GTI of each CCD.
Exposure correction is the time inside each frame where the CCD
is taking data correctly (no counting or MIP problems). This
correction will be calculated using the values of the FRACEXP
column in the EXPOSUnn extension. Being FRACEXP the
effective time fraction of each frame.
For PN data in imaging mode, if the events were not randomized,
epiclccorr
will automatically randomize the events.
Dead Time correction is the time where the CCD is not active
(CCD read out time). This correction will be calculated using the Live Time and Frame Time values of each mode.
The EXPOSUnn extension, together with the keywords FRMTIME, TIMEDEL, etc... will be used to calculate the Dead Time correction.