XMM-Newton Science Analysis System


eprejectti (eprejectti-0.2) [xmmsas_20160201_1833-15.0.0]

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Caveats: things to take into account when using the screened data

Screening the data on the Flare column requires the user to keep several things in mind when interpreting the data down to 200 eV.

• Spectra: They are problematic as all photons in the given PHA range during soft flares are removed from the eventfile (both source and softflare events). Spectral fits to the screened data can be performed for PHA values greater than the upper PHA limit given by the user. Below that the total exposure time is reduced as a consequence of the flare removal. A correct handling for this would require energy dependent GTIs. In the future a method for statistically separating source and softflare events could correct this but could be problematic for strongly variable sources.

• Timing: There is no problem above the upper PHA limit. But below the upper PHA limit the same applies here as for the spectra. Here also as a consequence of the flare removal the total exposure time is reduced.