{
  "bibcode": "2014GCN.16417....1S",
  "body": "M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), A.P. Beardmore\n(U. Leicester), P.A. Evans (U. Leicester), B.P. Gompertz (U.\nLeicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), M. de Pasquale\n(INAF-IASFPA) and M. De Pasquale report on behalf of the Swift-XRT\nteam:\n\nWe have analysed 7.3 ks of XRT data for GRB 140619A (De Pasquale  et\nal. GCN Circ. 16415),  from 129 s to 30.3 ks after the\tBAT trigger.\nThe data comprise 112 s in Windowed Timing (WT) mode (the first 9 s\nwere taken while Swift was slewing) with the remainder in Photon\nCounting (PC) mode. The enhanced XRT position for this burst was given\nby Goad et al. (GCN Circ. 16416).\n\nThe late-time light curve (from T0+5.1 ks) can be modelled with  a\npower-law decay with a decay index of alpha=0.93 (+/-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 0.67 (+/-0.05). The\nbest-fitting absorption column is  1.9 (+/-0.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.6 x 10^20 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 2.09 (+0.15, -0.14)\nand a best-fitting absorption column of 2.5 (+/-0.5) x 10^21 cm^-2. The\ncounts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum  is 3.4 x 10^-11 (5.1 x 10^-11) erg cm^-2\ncount^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     2.5 (+/-0.5) x 10^21 cm^-2\nGalactic foreground: 1.6 x 10^20 cm^-2\nExcess significance: 7.7 sigma\nPhoton index:\t     2.09 (+0.15, -0.14)\n\nIf the light curve continues to decay with a power-law decay index of\n0.93, the count rate at T+24 hours will be 0.031 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x\n10^-12 (1.6 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/00602080.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 16417,
  "createdOn": 1403222164000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 140619A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 140619A"
}