{
  "bibcode": "2014GCN.16550....1D",
  "body": "V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), V. Mangano (PSU), M.C.\nStroh (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), B.P.\nGompertz (U. Leicester), J.P. Osborne (U. Leicester), A. Maselli \n(INAF-IASFPA) and L.M.Z. Hagen report on behalf of the Swift-XRT team:\n\nWe have analysed 7.1 ks of XRT data for GRB 140709A (Hagen  et al. GCN\nCirc. 16546),  from 75 s to 30.7 ks after the  BAT trigger. The data\ncomprise 195 s in Windowed Timing (WT) mode (the first 6 s were taken\nwhile Swift was slewing) with the remainder in Photon Counting (PC)\nmode. \n\nThe late-time light curve (from T0+5.7 ks) can be modelled with  a\npower-law decay with a decay index of alpha=0.89 (+0.08, -0.09).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 2.48 (+/-0.07). The\nbest-fitting absorption column is  9.9 (+/-0.5) x 10^21 cm^-2, in\nexcess of the Galactic value of 4.1 x 10^21 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 1.88 (+/-0.14) and a\nbest-fitting absorption column of 8.0 (+1.2, -1.1) x 10^21 cm^-2. The\ncounts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum  is 4.9 x 10^-11 (8.0 x 10^-11) erg cm^-2\ncount^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     8.0 (+1.2, -1.1) x 10^21 cm^-2\nGalactic foreground: 4.1 x 10^21 cm^-2\nExcess significance: 5.8 sigma\nPhoton index:\t     1.88 (+/-0.14)\n\nIf the light curve continues to decay with a power-law decay index of\n0.89, the count rate at T+24 hours will be 0.038 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.9 x\n10^-12 (3.1 x 10^-12) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00603810.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 16550,
  "createdOn": 1404919683000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 140709A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 140709A"
}