{
  "bibcode": "2012GCN.13653....1P",
  "body": "C. Pagani (U Leicester) reports on behalf of the Swift-XRT team:\n\nWe have analysed 8.5 ks of XRT data for GRB 120815A (Pagani  et al. GCN\nCirc. 13645), from 2.7 ks to 39.5 ks after the\tBAT trigger. The data\nare entirely in Photon Counting (PC) mode. The enhanced XRT position\nfor this burst was given by Goad et al. (GCN. Circ 13650).\n\nThe light curve can be modelled with  a power-law decay with a decay\nindex of alpha=0.89 (+/-0.07).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.85 (+0.12, -0.11). The\nbest-fitting absorption column is  5.5 (+4.2, -3.8) x 10^21 cm^-2, at a\nredshift of 2.358, in addition to the Galactic value of 8.6 x 10^20\ncm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed)\n0.3-10 keV flux conversion factor deduced from this spectrum  is 4.0 x\n10^-11 (5.0 x 10^-11) erg cm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nGalactic foreground: 8.6 x 10^20 cm^-2\nIntrinsic column:    5.5 (+4.2, -3.8) x 10^21 cm^-2 at z=2.358\nPhoton index:\t     1.85 (+0.12, -0.11)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00531003.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 13653,
  "createdOn": 1345061073000,
  "email": "cp232@star.le.ac.uk",
  "subject": "GRB 120815A: Swift-XRT refined Analysis",
  "submitter": "Claudio Pagani at U of Leicester  <cp232@star.le.ac.uk>",
  "eventId": "GRB 120815A"
}