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Spectral Extraction at SPE level
The ``standard'' spectral extraction procedure is carried out at the
SPE level of the jemx_science_analysis script by
re-formatting the source fluxes found at the IMA step. The file jmx2_srcl_res.fits serves as input for the spectral extraction in
each ScW. It is important to note, however, that j_ima_iros
will always find a little bit different source positions in different
ScWs. The deviation of the found source position from the true one may
lead to an error in determination of the source spectrum. To avoid
this difficulty it is recommended to create a ``user catalog'' with
the names and positions of the sources for which you want to extract
the spectra.
For example, in the considered case, the source of interest is the
Crab and one can just copy the corresponding line from the general
reference catalog:
fcopy "${ISDC_REF_CAT}[NAME=='Crab']" user_cat.fits
In the new user_cat.fits file you have to change the FLAG
column to 1: in this case jemx_science_analysis would
directly copy the source position information to the jmx2_srcl_res.fits
after IMA step (see Sections 6.7.6 and 8.6.1 for an explanation on the possible FLAG values).
Next: Energy binning definition
Up: Source Spectra Extraction
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