{
  "bibcode": "2019GCN.25286....1O",
  "body": "J.P. Osborne (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC),\nV. D'Elia (ASDC), A. Tohuvavohu (PSU), J.A. Kennea (PSU), B. Sbarufatti\n(PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A.\nEvans (U. Leicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has conducted further observations of the field of the\nMAXI-detected burst GRB 190804B (Sato et al. GCN Circ. 25262). The\nobservations now extend from T0+37.2 ks to T0+273.4 ks. \n\nOf the sources reported by Osborne et al. (GCN Circ. 25273), \"Source 2\"\nhas faded from 1.1e-01 count/s to 1.1e-03 count/s between observations\nand is\tbelieved to be the afterglow.  The position of this source\n(astrometrically enhanced by using the XRT-UVOT alignment and matching\nUVOT field sources to the USNO-B1 catalogue) is RA, Dec=240.0251,\n-44.7816 which is equivalent to:\n\nRA (J2000): 16:00:6.02\nDec(J2000): -44:46:53.9\n\nwith an uncertainty of 3.8 arcsec (radius, 90% confidence). Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and\nEvans et al. (2009, MNRAS, 397, 177). This position is 5.6 arcmin from\nthe MAXI position.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00020916.\nThe results of the full analysis of the tiled XRT observations are\navailable at https://www.swift.ac.uk/xrt_products/TILED_GRB00082.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 25286,
  "createdOn": 1565253805000,
  "email": "ab271@leicester.ac.uk",
  "subject": "GRB 190804B: Swift-XRT afterglow detection",
  "submitter": "Andy Beardmore at U Leicester  <ab271@leicester.ac.uk>",
  "eventId": "GRB 190804B"
}