{
  "bibcode": "2011GCN.12376....1M",
  "body": "V. Mangano (INAF-IASFPA), B. Sbarufatti (INAF-OAB/IASFPA),\nP. A. Evans (U Leicester), H. A. Krimm (GSFC/USRA)\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 13.1 ks of XRT data for GRB 110918A, from 107.4 ks\nto 211.3 ks after the IPN trigger (Hurley et al. GCN Circ. 12357).\nThe data are in Photon Counting (PC) mode. The enhanced XRT\nposition for this burst was given by Mangano et al. (GCN Circ. 12364).\n\nThe light curve can now be modeled with a single power-law decay\nwith index alpha=1.49 (+0.24, -0.25). This confirms the XRT\nsource is the afterglow of the GRB.\n\nThe PC mode spectrum has a photon index of 2.11 (+0.21, -0.19)\nand a best-fitting absorption column at redshift z=0.982\n(Levan et al. GCN Circ. 12368) of 6.3 (+2.8, -2.1) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum  is\n3.0 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00020186.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 12376,
  "createdOn": 1316621096000,
  "email": "vanessa@ifc.inaf.it",
  "subject": "GRB 110918A: Swift-XRT refined Analysis",
  "submitter": "Vanessa Mangano at INAF-IASFPA  <vanessa@ifc.inaf.it>",
  "eventId": "GRB 110918A"
}