TITLE: GCN CIRCULAR NUMBER: 27811 SUBJECT: GRB 200524A: Swift-XRT afterglow detection DATE: 20/05/25 04:14:56 GMT FROM: Kim Page at U.of Leicester M. Capalbi (INAF-IASFPA), M. Perri (ASDC), V. D'Elia (ASDC), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 200524A (Fana Dirirsa et al. GCN Circ. 27797), collecting 5.0 ks of Photon Counting (PC) mode data between T0+36.4 ks and T0+55.7 ks. Four uncatalogued X-ray sources are detected, of which one ("Source 6") is believed to be the afterglow. Using 1644 s of PC mode data and 1 UVOT image, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 213.04474, +60.90538 which is equivalent to: RA (J2000): 14h 12m 10.74s Dec(J2000): +60d 54' 19.4" with an uncertainty of 4.4 arcsec (radius, 90% confidence). This position is 9.2 arcmin from the Fermi/LAT position, and 3 arcsec from ZTF20abbiixp (Ho et al., GCN 27799). The light curve can be modelled with a power-law decay with a decay index of alpha=3.42 (+0.06, -2.83). The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021001. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021001. This circular is an official product of the Swift-XRT team.