Evans, P. A.P. A.EvansPage, K. L.K. L.PageBearmore, A. P.A. P.BearmoreEyles-Ferris, R. A. J.R. A. J.Eyles-FerrisOsborne, J. P.J. P.OsborneCAMPANA, SergioSergioCAMPANAKennea, J. A.J. A.KenneaCenko, S. B.S. B.Cenko2025-02-262025-02-2620230035-8711http://hdl.handle.net/20.500.12386/36281We present the Living Swift-XRT Point Source catalogue (LSXPS) and real-time transient detector. This system allows us for the first time to carry out low-latency searches for new transient X-ray events fainter than those available to the current generation of wide-field imagers, and report their detection in near real-time. Previously, such events could only be found in delayed searches, e.g. of archival data; our low-latency analysis now enables rapid and ongoing follow up of these events, enabling the probing of timescales previously inaccessible. The LSXPS is, uniquely among X-ray catalogues, updated in near real-time, making this the first up-to-date record of the point sources detected by a sensitive X-ray telescope: the Swift-X-ray Telescope (XRT). The associated upper limit calculator likewise makes use of all available data allowing contemporary upper limits to be rapidly produced on-demand. These facilities, which enable the low-latency transient system are also fully available to the community, providing a powerful resource for time-domain and multi-messenger astrophysics.STAMPAenArticle10.1093/mnras/stac29372-s2.0-85151350814http://arxiv.org/abs/2208.14478v2https://academic.oup.com/mnras/article/518/1/174/6764727FIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation