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XMM-Newton Science Analysis System


arfgen (arfgen-1.70.4) [xmmsas_20060628_1801-7.0.0]

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Timing and Burst modes

These modes are treated as a special case within arfgen. Regardless of the spatial region used to extract the spectra the source is assumed to be located at the position DETX=0, DETY=0 and the vignetting correction is applied assuming a point source at this position. An encircled energy correction is applied to the ARF and bad pixels or columns are corrected for.

In Timing mode it is recommended to take the full range of RAW-Y when extracting an EPIC-pn spectrum (in MOS the RAW-Y information is not present). It can be useful to take a restricted RAW-Y range in Burst mode to exclude contamination from the on-axis source. In this case arfgen scales the ARF proportionately to the range selected. Such a scaling is not applied for Timing mode data.