XMM-Newton Science Analysis System: User Guide

6.2.6 Source variability: omvariability

• omvariability (step15). If an observation contains several exposures obtained with the same filter, the task omvariability reads the source lists of all exposures within the observation and looks for variability of all detected sources. A chi square test is run to assess possible variability. The results are added to the combined source list, and light curves are plotted for the sources considered as variable. See the SAS on-line documentation for further details.