{
  "bibcode": "2017GCN.21343....1D",
  "body": "P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. Cholden-Brown (PSU), S. J.\nLaPorte (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A.\nEvans (U. Leicester), S.L. Gibson (U. Leicester) and A. D'Ai report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 8.8 ks of XRT data for GRB 170714A (D'Ai et al. GCN\nCirc. 21340), from 383 s to 22.6 ks after the  BAT trigger. The data\ncomprise 1.3 ks in Windowed Timing (WT) mode (the first 8 s were taken\nwhile Swift was slewing) with the remainder in Photon Counting (PC)\nmode. The enhanced XRT position for this burst was given by Evans et\nal. (GCN Circ. 21341). The late-time light curve (from T0+5.0 ks) is\nconsistent with a constant source of mean count rate 1.4e+01 ct/sec. A\npower-law fit gives an index of 1.7 (+1.8, -2.8).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.588 (+/-0.018). The\nbest-fitting absorption column is  9.3 (+/-0.6) x 10^20 cm^-2, in\nexcess of the Galactic value of 3.6 x 10^20 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 1.73 (+/-0.05) and a\nbest-fitting absorption column of 9.0 (+/-1.5) x 10^20 cm^-2. The\ncounts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum  is 3.9 x 10^-11 (4.4 x 10^-11) erg cm^-2\ncount^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     9.0 (+/-1.5) x 10^20 cm^-2\nGalactic foreground: 3.6 x 10^20 cm^-2\nExcess significance: 6.1 sigma\nPhoton index:\t     1.73 (+/-0.05)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00762535.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 21343,
  "createdOn": 1500081380000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 170714A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 170714A"
}