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In-Orbit Vignetting Calibrations of XMM-Newton Telescopes

Finoguenov, A.; Gondoin, P.; Aschenbach, B. +4 more

We describe measurements of the mirror vignetting in the XMM-Newton Observatory made in-orbit, using observations of SNR G21.5-09 and SNR 3C58 with the EPIC imaging cameras. The instrument features that complicate these measurements are briefly described. We show the spatial and energy dependences of measured vignetting, outlining assumptions made…