//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28071 SUBJECT: GRB 200709B: Tiled Swift observations DATE: 20/07/09 06:00:54 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a series of observations, tiled on the sky, of the HAWC GRB 200709B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00091 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the HAWC event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28072 SUBJECT: GRB 200709B: Swift-XRT observations DATE: 20/07/09 13:50:53 GMT FROM: Antonino D'Ai at IASF-PA J.P. Osborne (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (ASDC), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), 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 HAWC-detected burst GRB 200709B in a series of observations tiled on the sky. The total exposure time is 4.9 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 1.4 ks. The data were collected between T0+5.1 ks and T0+16.9 ks, and are entirely in Photon Counting (PC) mode. Two 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 1: RA (J2000.0): 252.0755 = 16:48:18.12 Dec (J2000.0): +15.0921 = +15:05:31.6 Error: 5.8 arcsec (radius, 90% conf.) Count-rate: 0.0165 [+0.0067, -0.0053] ct s^-1 Distance: 1121 arcsec from HAWC position. Source 3: RA (J2000.0): 252.3306 = 16:49:19.35 Dec (J2000.0): +15.4197 = +15:25:11.0 Error: 6.2 arcsec (radius, 90% conf.) Count-rate: (7.3 [+4.4, -3.2])e-3 ct s^-1 Distance: 791 arcsec from HAWC position. A catalogued source was 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_GRB00091. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28075 SUBJECT: GRB 200709B/HAWC-200907A: Swift-XRT further observations DATE: 20/07/10 18:04:03 GMT FROM: Antonino D'Ai at IASF-PA A. DAi (INAF/IASFPA), E. Ambrosi (INAF/IASFPA), V. D'Elia (ASDC) report on behalf of the Swift XRT team. Swift performed a second observation for the candidate Source 1 present in the field of GRB 200709B/HAWC-200907A (Osborne et al., GCN 28072), with a 3.0 ks exposure between T0+52.6 ks and T0+40.0 ks. Source 1 is still detected at the same flux level and it is therefore unlikely to be the afterglow. This circular is an official product of the Swift XRT team.