TITLE: GCN CIRCULAR NUMBER: 27640 SUBJECT: GRB 200424A: Swift-XRT observations DATE: 20/04/25 11:11:26 GMT FROM: Paolo D'Avanzo at INAF - OAB M. Perri (ASDC), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (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 INTEGRAL-detected burst GRB 200424A (Mereghetti et al. GCN Circ. 27634), collecting 5.0 ks of Photon Counting (PC) mode data between T0+13.2 ks and T0+30.7 ks. One uncatalogued X-ray source has been detected consistent with being within the INTEGRAL position, however it is below the RASS limit and shows no definitive signs of fading. Therefore, at the present time we cannot confirm this as the afterglow. Details of this source are given below: Source 1: RA (J2000.0): 307.5055 = 20:30:01.31 Dec (J2000.0): -39.7001 = -39:42:00.5 Error: 3.0 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: (8.3 [+1.7, -1.6])e-3 ct s^-1 Distance: 22 arcsec from INTEGRAL position. Flux: (2.68 [+0.55, -0.52])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Seven uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00020989. This circular is an official product of the Swift-XRT team.