MSSL is involved in several aspects of XMM-Newton, in particular the Optical Monitor (OM) and the Remote Grating Spectrometer (RGS). Please see the XMM-Newton, OM and RGS for further information on the instrumentation and projects.

The XMM-OM Serendipitous Ultra-violet Source Survey (XMM-SUSS) is a catalogue of Optical and UV sources detected serendipitously by the Optical Monitor (OM) on-board the European Space Agency's (ESA's) XMM-Newton observatory. The data were processed at the European Space Astronomy Centre (ESAC, Madrid, Spain) and at the University College London's (UCL's) Mullard Space Science Laboratory (MSSL) on behalf of ESA and is a partner resource to the 3XMM serendipitous X-ray source catalogue. 

NEW for 2017:

The third version of the XMM-SUSS catalogue was released in March 2017 and is now available as XMM-SUSS3, using data up to July 2015. This version uses an updated time dependent sensitivity degradation. Also the photometry of faint sources detected in stacked images has been improved, and these entries in the catalogue are flagged using new SKY_IMAGE columns.

The previous version  XMM-SUSS2.1 includes all data to the end of 2013. 

A supplementary catalogue using readout streak photometry for sources too bright to be included in the main XMM-SUSS2.1 catalogue is also available, and should be available for XMM-SUSS3 soon.