ISGRI light curve

The role of a catalog

It is important to understand that the INTEGRAL instruments are equipped with coded mask. It is tus necessary to specify a sky model to extract spectra or light curve. If you do not supply a catalog, the infrastructure will first produce an image and take all the source, with possible contamination from spurious detections. See the IBIS user manual for details.

It is thus strongly encouraged to prepare explicitely a catalog through an image, edit the catalog and then submit the spectral extraction. A common practice is to make an image from a subset of science windows by adjusting the "Maximum number of ScWs" parameter and then extract a spectrum from all science windows. In the platform, a defaul binning is applied to the spectrum.

Note that all this can be done also using the python API, see this notebook.

Light-curve extraction from a catalog

Suppose that you have succesfully extracted an image and get to the point

You should delete the source and the select Light curve with the relative time bins (see the red-shaded region below).

Once the light curve is ready, you will receive an email as

You can then click on the URL and then click on "Close".

to obtain

you click on "view" the lightcurve you prefer and this can be visualized and then downloaded clicking the "Download" button.

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