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Eclectic Orbit Detector
Note For Eclectic Orbit Detector (EOD)
Users:
EOD data files contain data from only one of the two
clusters but are not split further into on-source and
off-source files. To create separate data files for further
processing, you can use the ftool fselect. How exactly
this is done depends on whether your EOD data are in science
array or science event format. In both cases, fselect operates
on the ClstrPosition column, but the selection
criteria differ.
For EOD science array data, the values of ClstrPosition
corresponding to the on-source position are 0 and 3 for
1.5-degree and 3-degree rocking, respectively. This means that
to create a file containing only on-source data, the following
fselect criterion should be used:
ClstrPosition.eq.0.or.ClstrPosition.eq.3
And to create the off-source file, use:
ClstrPosition.ne.0.and.ClstrPosition.ne.3
For EOD science event data, the values of ClstrPosition
corresponding to the on-source position are 1 (or 65) and 8
(or 72) for 1.5-degree and 3-degree rocking, respectively.
This means that to create a file containing only on-source
data, the following fselect criterion should be used:
ClstrPosition.eq.1.or.ClstrPosition.eq.65.or.ClstrPosition.eq.65.or.
ClstrPosition.eq.72
And to create the off-source file, use:
ClstrPosition.ne.1.and.ClstrPosition.ne.65.and.ClstrPosition.ne.65.and.
ClstrPosition.ne.72
For example, to create the file event_off.fits containing
only off-source data from the science event file FS50_3eb70b0-3eb8950:
kaah[16]% fselect
Name of FITS file and [ext#][] FS50_3eb70b0-3eb8950
Name of output FITS file[] event_0_off.fits
Selection Expression[] ClstrPosition.eq.1.or.ClstrPosition.eq.65.or.ClstrPosition.eq.65.or.
ClstrPosition.eq.72
Following this procedure should eliminate any difficulties
you might be experiencing.
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