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Displaying the Results of the Spectral Extraction

The ISGRI systematics are typically of the order of 1%. We add this explicitly to the 4U1700_sum_pha.fits file with the command below:

cd $REP_BASE_PROD/obs/isgri_gc
fparkey 0.02 4U1700_sum_pha.fits SYS_ERR  add=yes
One can now analyse the average spectrum with XSpec as:
xspec
    cpd /xw
    data  4U1700_sum_pha.fits 
    setplot energy
    ign 300.-**
    model cutoffpl
    fit
    plot ldata delchi
    hardcopy 4U1700_spe.ps
The resulting total spectrum of 4U 1700-377 saved to file 4U1700_spe.ps is shown in Figure 20.


Table 3: Instance number to use
Period Revolution interval ARF instance XX
    isgr_arf_rsp_00XX.fits
1 1 - 63 31
2 64 - 135 32
3 136 - 254 33
4 255 - 370 34
5 371 - 481 35
6 482 - 635 36
7 636 - 750 37
8 751 - 800 38
9 801 - 900 39
10 901 -1000 40
11 1001 - 1123 41
12 1124 - 42

In the very same manner, you can sum up the spectra for all the sources of the input catalog, specified in the SCW2_cat_for_extract parameter[*].

Figure 20: Total spectrum of 4U 1700-377 fitted with a cut-off powerlaw model.
Image 4u

Usage of spe_pick for spectra created in different observation groups is explained in Section 9.


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Next: Lightcurve Extraction Up: Spectral Extraction Previous: Results of the Spectral   Contents
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