{
  "bibcode": "2020GCN.28150....1D",
  "body": "V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), B. Sbarufatti (PSU), D.N.\nBurrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), J.P.\nOsborne (U. Leicester), A. Melandri (INAF-OAB) and P.A. Evans (U.\nLeicester) report on behalf of the Swift-XRT team:\n\nSwift-XRT has conducted further observations of the field of the\nSwift/BAT-GUANO-detected burst GRB 200714E (Tohuvavohu et al. GCN Circ.\n28103). The observations now extend from T0+37.4 ks to T0+578.8 ks. The\nsource previously reported by D'Elia et al. (GCN Circ. 28107), \"Source\n1\", is fading with 3-sigma significance, and is therefore likely the\nGRB afterglow. Using 4152 s of PC mode data and 4 UVOT images, we find\nan enhanced XRT position (using the XRT-UVOT alignment and matching\nUVOT field sources to the USNO-B1 catalogue): RA, Dec = 196.82291,\n-51.63937 which is equivalent to:\n\nRA (J2000): 13h 07m 17.50s\nDec(J2000): -51d 38' 21.7\"\n\nwith an uncertainty of 2.2 arcsec (radius, 90% confidence). This\nposition is 95 arcsec from the Swift/BAT position.  The source is\nfading with alpha >0.5.\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.6 (+0.6, -0.3). The\nbest-fitting absorption column is  consistent with the Galactic value\nof 3.1 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum  is 4.6 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     3.1 (+/-2.2) x 10^21 cm^-2\nGalactic foreground: 3.1 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t     1.6 (+0.6, -0.3)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021017.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021017.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 28150,
  "createdOn": 1595344690000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 200714E: Swift-XRT afterglow detection",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 200714E"
}