Results from the Image Step

When the analysis is finished, you will find that new files have appeared in your working directory. In Figure 14 an overview of the files related to the image reconstruction is given. The full description of all files produced at different levels is given in Appendix C.

Figure 14: Overview of the IMA level products

As it is shown in Figure 14, there are results for each science window as well as for the overall group.

Science window results include:

• Images: scw/0051004X0010.001/isgri_sky_ima.fits (where X=1..5)
  for each energy range five images are produced: INTENSITY, VARIANCE, SIGNIFICANCE and RESIDUAL and EXPOSURE. To know which type of image and which energy band correspond to a given extension, you can either check in the header of the isgri_sky_ima.fits file extensions, or check the first extension of the file, an index, summarizing the file content. In Figure 15 the column highlighted in green was added by hand to identify the corresponding extensions of the file. More details on index concept are in [1].
• Detected source list: scw/0051004X0010.001/isgr_sky_res.fits (where X=1..5)
  list of the sources detected in each energy range with reconstructed RA, DEC, flux, error and significance.

Observation group results include:

• Image: isgri_mosa_ima.fits
  The structure of this file with the mosaic images is similar to the one of isgri_sky_ima.fits, but instead of residual maps you have the exposure ones.
• Detected source list: isgri_mosa_res.fits
  list of the sources detected in the mosaic image in each energy range with reconstructed RA, DEC, flux, error and significance.

The single science window and mosaic results are merged in the file isgri_srcl_res.fits. This file contains all the sources from the isgri_catalog.fits plus all the new sources, with the information on their fitted position, fluxes, and detection level.

You find more details on the structure of the output files in Section C.7.1.

Figure 15: A part of the GROUPING extension table of an isgri_sky_ima.fits file.