{
  "bibcode": "2012GCN.13459....1P",
  "body": "K.L. Page (U. Leicester), C. Pagani (U. Leicester), B. Sbarufatti\n(INAF-OAB/PSU), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), M.C. Stroh\n(PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), A.P. Beardmore (U.\nLeicester) and M.J. Page report on behalf of the Swift-XRT team:\n\nWe have analysed 6.2 ks of XRT data for GRB 120712A (Page  et al. GCN\nCirc. 13454), from 94 s to 12.9 ks after the  BAT trigger. The data\ncomprise 90 s in Windowed Timing (WT) mode with the remainder in Photon\nCounting (PC) mode. The enhanced XRT position for this burst was given\nby Osborne et al. (GCN. Circ 13456).\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=0.87 (+/-0.06), followed by a break at T+3706 s to an\nalpha of 1.80 (+0.33, -0.29).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.16 (+0.17, -0.14). The\nbest-fitting absorption column is  5.0 (+3.1, -1.4) x 10^20 cm^-2,\nconsistent with the Galactic value of 3.6 x 10^20 cm^-2 (Kalberla et\nal. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux\nconversion factor deduced from this spectrum  is 3.3 x 10^-11 (4.0 x\n10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     5.0 (+3.1, -1.4) x 10^20 cm^-2\nGalactic foreground: 3.6 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t     2.16 (+0.17, -0.14)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00526351.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 13459,
  "createdOn": 1342144327000,
  "email": "pae9@star.le.ac.uk",
  "subject": "GRB 120712A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@star.le.ac.uk>",
  "eventId": "GRB 120712A"
}