{
  "bibcode": "2011GCN.12609....1K",
  "body": "J. A. Kennea (PSU) and T. Sakamoto (GSFC/UMBC) report on behalf of the\nSwift-XRT team:\n\nWe have analysed 3.0 ks of XRT data for the GBM/BAT-detected burst:\nGRB111201A (Sakamoto et al. et al. GCN Circ. 12608), from 26.5 ks to\n32.7 ks after the  GBM/BAT trigger. The data are entirely in Photon\nCounting (PC) mode.  An X-ray source is detected within the GBM/BAT\nerror circle. The refined XRT position is RA, Dec = 190.47701,\n+32.98791 which is equivalent to:\n\nRA (J2000): 12 41 54.48\nDec(J2000): +32 59 16.5\n\nwith an uncertainty of 3.6 arcsec (radius, 90% confidence). This\nposition is 32 arcsec from the BAT position. \n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.3 (+/-0.4). The\nbest-fitting absorption column is  3.6 (+1.7, -1.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.3 x 10^20 cm^-2 (Kalberla et al.\n2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum  is 3.7 x 10^-11 (7.3 x 10^-11) erg\ncm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     3.6 (+1.7, -1.4) x 10^21 cm^-2\nGalactic foreground: 1.3 x 10^20 cm^-2\nExcess significance: 4.1 sigma\nPhoton index:\t     2.3 (+/-0.4)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00020188.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 12609,
  "createdOn": 1322797443000,
  "email": "kennea@swift.psu.edu",
  "subject": "GRB111201A: Swift-XRT observations",
  "submitter": "Jamie A. Kennea at PSU/Swift-XRT  <kennea@swift.psu.edu>",
  "eventId": "GRB 111201A"
}