TITLE: GCN CIRCULAR NUMBER: 41119 SUBJECT: GRB 250717B: Swift-XRT observations DATE: 25/07/18 16:03:37 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), S. Campana (INAF-OAB), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), D.N. Burrows (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/GBM-detected burst GRB 250717B, collecting 2.8 ks of Photon Counting (PC) mode data between T0+27.9 ks and T0+34.0 ks. One uncatalogued X-ray source has been detected within the estimated BAT-GUANO error region (3 arcmin), 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): 44.1037 = 02:56:24.88 Dec (J2000.0): +26.3758 = +26:22:32.8 Error: 8.9 arcsec (radius, 90% conf.) Count-rate: (1.90 [+1.27, -0.91])e-3 ct s^-1 Distance: 47 arcsec from BAT-GUANO position. 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/00021846. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/41119. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...