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=yesOne 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.psThe resulting total spectrum of 4U 1700-377 saved to file 4U1700_spe.ps is shown in Figure 20.
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.
Usage of spe_pick for spectra created in different observation groups is explained in Section 9.