TITLE: GCN CIRCULAR NUMBER: 36478 SUBJECT: GRB 240513A: Swift-XRT observations DATE: 24/05/14 14:35:11 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> M. Ferro (INAF-OAB), R. Brivio (INAF-OAB), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 240513A in a series of observations tiled on the sky. The total exposure time is 5.1 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 1.6 ks. The data were collected between T0+46.1 ks and T0+80.7 ks, and are entirely in Photon Counting (PC) mode. Three uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 2: RA (J2000.0): 163.8237 = 10:55:17.69 Dec (J2000.0): -27.6225 = -27:37:20.9 Error: 9.7 arcsec (radius, 90% conf.) Count-rate: (8.6 [+4.8, -3.5])e-3 ct s^-1 Distance: 1422 arcsec from Fermi/LAT position. Source 4: RA (J2000.0): 163.9338 = 10:55:44.10 Dec (J2000.0): -27.5934 = -27:35:36.2 Error: 7.6 arcsec (radius, 90% conf.) Count-rate: (7.4 [+4.8, -3.4])e-3 ct s^-1 Distance: 1736 arcsec from Fermi/LAT position. Source 6: RA (J2000.0): 163.4544 = 10:53:49.05 Dec (J2000.0): -27.4116 = -27:24:41.7 Error: 5.1 arcsec (radius, 90% conf.) Count-rate: 0.0224 [+0.0072, -0.0060] ct s^-1 Distance: 362 arcsec from Fermi/LAT position. Flux: (1.64 [+0.53, -0.44])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV) Two catalogued sources were also detected. The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00125. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/36478. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...