The XMM-Newton Slew Survey XMMSL3 Source Catalogue

The third version of the XMM-Newton slew survey catalogue, XMMSL3, has been released on 19th February 2025 by the XMM-Newton Survey Science Centre (XMM-SSC) in collaboration with the SOC. This version includes an extra 8.5 years of data with respect to XMMSL3. There are 140735 X-ray detections which relate to 116598 unique sources, doubling the number of detections available in the previous version, XMMSL2. These detections come from 3120 pn slew observations that were taken by the 23rd Auguest 2023. This catalogue version covers more than 90% of the sky, where some regions of the sky have been pointed as many as 78 times. Around 8% of all the detections are classified as extended. The median positional uncertainty of the clean catalogue detections is 4 arcseconds. Median fluxes in the catalogue are ~1.1E-12 and ~9.0E-12 erg/cm2/s in the soft (0.2-2 keV) and hard (2-12 keV) X-ray band, respectively.