Combining Lightcurves from Different Science Windows

Similar to the spectral case there is the tool lc_pick (see [1] for details) to combine the lightcurves from the single Science Windows.

lc_pick group="og_jmx2.fits" source="Crab"\
   lc="crab_lc.fits"

The resulting file contains two lightcurves, one for each energy band. One of the obtained lightcurves is shown in Figure .

Figure: Crab lightcurve, first energy band.

It is also possible to sum up lightcurves from different observation groups. The method to do this is the same as in the spectral case, and is explained in section .

The vignetting by the collimator and mask support structure of JEM-X has a more complex structure than originally thought. Therefore, source fluxes can vary significantly, of the order of 10%, from one Science Window to the next. At off-axis angles of 5 degrees this can even reach 30% in bad cases. The modeling of vignetting at the IMA and SPE steps is at the moment much better than this.