XMM-Newton Science Analysis System: User Guide

4.4.6 Correcting an EPIC-pn event file for energy shifts.

As of SAS v21.0, the task evenergyshift allows to add an ad-hoc energy shift to EPIC-pn events in an event file, taken from observations made with the FastTiming or FastBurst modes.

The task calculates the initial energy of the photon arriving in a CCD, using a large number of corrections based on temporal, spatial and energy information. Nevertheless, in some cases, the photon energies can still be seen to be shifted from their true positions, when modelling the spectrum in a spectral fitting package. This becomes obvious by looking at residuals which are visible around the Si $K_{\alpha}$ line at 1.84 keV and the Au-M edge at 2.2 keV and AU-L edge at 11.9 keV.

A SAS thread illustrates how to apply the corrections using evenergyshift, Correct for rate-dependent energy scale effects in the PN Burst and Timing mode.