TITLE: GCN CIRCULAR NUMBER: 36884 SUBJECT: GRB 240713A: Swift-XRT observations DATE: 24/07/16 10:03:54 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), B. Sbarufatti (INAF-OAB) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the SVOM-detected burst GRB 240713A in a series of observations tiled on the sky. The total exposure time is 4.0 ks, distributed over 1 tiles; the maximum exposure at a single sky location was 4.0 ks. The data were collected between T0+142.7 ks and T0+156.3 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. Source 3 is consistent in position and flux with EP J233058.2+015317, identified by EP-FXT in their follow-up observations (GCN 36859). The consistent flux between the two detections suggest that the source is not fading. Moreover, source 3 is spatially consistent with a catalogued 2MASS source (2MASS J23305766+0153156). Source 2 is spatially consistent and can be associated to a catalogued quasar (SDSS J233053.58+014603.0). Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 1: RA (J2000.0): 352.7279 = 23:30:54.70 Dec (J2000.0): +1.9401 = +01:56:24.5 Error: 6.7 arcsec (radius, 90% conf.) Count-rate: (1.55 [+1.06, -0.76])e-3 ct s^-1 Distance: 541 arcsec from SVOM position. Source 2: RA (J2000.0): 352.7219 = 23:30:53.25 Dec (J2000.0): +1.7664 = +01:45:59.2 Error: 7.4 arcsec (radius, 90% conf.) Count-rate: (1.63 [+1.13, -0.80])e-3 ct s^-1 Distance: 626 arcsec from SVOM position. Source 3: RA (J2000.0): 352.7404 = 23:30:57.69 Dec (J2000.0): +1.8868 = +01:53:12.6 Error: 6.1 arcsec (radius, 90% conf.) Count-rate: (2.33 [+1.24, -0.94])e-3 ct s^-1 Distance: 541 arcsec from SVOM position. Flux: (6.3 [+3.3, -2.5])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) 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_GRB00126. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/36884. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...