{
  "bibcode": "2014GCN.16922....1P",
  "body": "K.L. Page (U. Leicester), C. Pagani (U. Leicester), A. Melandri\n(INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), P. D'Avanzo (INAF-OAB), J.A.\nKennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU), A.P. Beardmore (U.\nLeicester) and F.E. Marshall report on behalf of the Swift-XRT team:\n\nWe have analysed 7.7 ks of XRT data for GRB 141017A (Marshall  et al.\nGCN Circ. 16919),  from 77 s to 18.8 ks after the  BAT trigger. The\ndata comprise 120 s in Windowed Timing (WT) mode (the first 6 s were\ntaken while Swift was slewing) with the remainder in Photon Counting\n(PC) mode. The enhanced XRT position for this burst was given by Goad\net al. (GCN Circ. 16921).\n\nThe late-time light curve (from T0+4.9 ks) can be modelled with  a\npower-law decay with a decay index of alpha=0.82 (+/-0.12).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 2.45 (+0.15, -0.14). The\nbest-fitting absorption column is  2.1 (+/-0.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 3.8 x 10^20 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 2.02 (+/-0.11) and a\nbest-fitting absorption column of 1.9 (+0.4, -0.3) x 10^21 cm^-2. The\ncounts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum  is 3.5 x 10^-11 (4.7 x 10^-11) erg cm^-2\ncount^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     1.9 (+0.4, -0.3) x 10^21 cm^-2\nGalactic foreground: 3.8 x 10^20 cm^-2\nExcess significance: 7.2 sigma\nPhoton index:\t     2.02 (+/-0.11)\n\nIf the light curve continues to decay with a power-law decay index of\n0.82, the count rate at T+24 hours will be 0.034 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 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/00615672.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 16922,
  "createdOn": 1413615005000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 141017A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 141017A"
}