{
  "bibcode": "2011GCN.11586....1D",
  "body": "V. D'Elia, G. Stratta (ASDC), E. Troja (NASA/GSFC/ORAU) report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 18 ks of XRT data for GRB 110119A (Troja  et al. GCN\nCirc. 11581), from 48 s to 45.5 ks after the  BAT trigger. The data\ncomprise 358 s in Windowed Timing (WT) mode (the first 8 s were taken\nwhile Swift was slewing) with the remainder in Photon Counting (PC)\nmode. The enhanced XRT position for this burst was given by Goad et al.\n(GCN. Circ 11582).\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=1.64 (+/-0.10).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.56 (+/-0.03). The\nbest-fitting absorption column is  1.80 (+/-0.11) x 10^21 cm^-2, in\nexcess of the Galactic value of 6.4 x 10^20 cm^-2 (Kalberla et al.\n2005). The PC mode spectrum has a photon index of 2.23 (+0.12, -0.11)\nand a best-fitting absorption column of 1.29 (+0.26, -0.14) x 10^21\ncm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum  is 3.5 x 10^-11 (5.2 x 10^-11) erg\ncm^-2 count^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     1.29 (+0.26, -0.14) x 10^21 cm^-2\nGalactic foreground: 6.4 x 10^20 cm^-2\nExcess significance: 15.3 sigma\nPhoton index:\t     2.23 (+0.12, -0.11)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00442978.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 11586,
  "createdOn": 1295534792000,
  "email": "delia@asdc.asi.it",
  "subject": "GRB 110119A: Swift-XRT refined Analysis",
  "submitter": "Valerio D'Elia at ASDC  <delia@asdc.asi.it>",
  "eventId": "GRB 110119A"
}