TITLE: GCN CIRCULAR NUMBER: 34829 SUBJECT: GRB 231017A: Swift-XRT observations DATE: 23/10/18 15:56:18 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> S. Dichiara (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Swift/BAT-GUANO-detected burst GRB 231017A (GCN Circ. 34824, DeLaunay et al.), collecting 4.2 ks of Photon Counting (PC) mode data between T0+32.7 ks and T0+101.7 ks. One uncatalogued X-ray source has been detected consistent with being within 493 arcsec of the Swift/BAT-GUANO position, 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 2: RA (J2000.0): 86.1666 = 05:44:39.99 Dec (J2000.0): +56.7487 = +56:44:55.3 Error: 8.4 arcsec (radius, 90% conf.) Count-rate: (2.09 [+1.11, -0.84])e-3 ct s^-1 Distance: 301 arcsec from Swift/BAT-GUANO position. Flux: (3.3 [+1.8, -1.3])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Two 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/00021623. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/34829. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...