XMM-Newton Science Analysis System


omsrclistcomb (omsrclistcomb-2.23) [xmmsas_20190531_1155-18.0.0]

POSERR

This column contains the standard error of the merged source position- ie $(1/n) \sqrt{ \sum_{k=1}^n err_k^2 }$ , where $err_k$ are the position errors of the n individual sources. Note that input errors from the individual source-list files are first converted from pixels to arcsecs.