A new version of the XMM-Newton EPIC Serendipitous Source Catalogue, 4XMM-DR14, has been released by the XMM-Newton Survey Science Centre (XMM-SSC) in collaboration with the XMM-Newton SOC. This version includes an extra year of data with respect to 4XMM-DR13.

4XMM-DR14 now has over a million X-ray detections (1035832) which relate to 692109 unique X-ray sources from 13864 observations that were public by the 31st December 2023. 4XMM-DR14 covers a total sky area, with at least 1000 seconds of exposure, of 1383 square degrees if overlaps are taken into account, where some regions of the sky have been pointed as many as 90 times.

With the detection catalogue 4XMM-DR14, the stacked catalogue 4XMM-DR14s was released, created from overlapping observations. Some sources have a total of ~3 Ms (1,000,000 seconds) of observation. Stacking results in better source parameters, higher sensitivity, and direct access to measures of long-term flux variability. 4XMM-DR14s is built from 1751 groups drawn from 10332 observations. Stacked source detection is performed on all overlapping exposures of reasonable quality. 4XMM-DR14s contains 427524 sources, of which 329972 have several contributing observations. From the individual observations, 1.8 million individual flux measurements (and related parameters) of all the sources are derived in total during stacked source detection and photometry.

More information about the X-ray catalogues can be found here:
http://xmm-ssc.irap.omp.eu/xmm2athena/catalogues/