{
  "bibcode": "2010GCN.10846....1M",
  "body": "R. Margutti, B. Sbarufatti (INAF-OAB) and G. Stratta (ASDC) report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 1.4 ks of XRT data for GRB 100614A (Stratta et al. GCN\nCirc. 10837), from 136 s to 1.6 ks after the BAT trigger. The data\ncomprise 319 s in Windowed Timing (WT) mode with the remainder in Photon\nCounting (PC) mode. The light curve can be modelled with an initial\npower-law decay with an index of alpha=1.79 (+/-0.11) followed by a break\naround T+300 s to an alpha of 2.51 (+0.12, -0.10). X-ray flaring activity\nis detected in the first 300 s of observation.\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.84 (+/-0.05). The best-fitting\nabsorption column is 1.80 (+/-0.15) x 10^21 cm^-2, in excess of the\nGalactic value of 2.2 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode\nspectrum has a photon index of 1.92 (+0.21, -0.20) and a best-fitting\nabsorption column of 1.0 (+/-0.5) x 10^21 cm^-2. The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum\nis 4.1 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1.\n\nIf the light curve continues to decay with a power-law decay index of\n2.51, the count rate at T+24 hours will be 1.3 x 10^-5 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.2 x 10^-16\n(6.5 x 10^-16) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00424716.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 10846,
  "createdOn": 1276596116000,
  "email": "raffaella.margutti@brera.inaf.it",
  "subject": "GRB 100614A: Swift-XRT refined analysis",
  "submitter": "Raffaella Margutti at U. di Milano Bicocca  <raffaella.margutti@brera.inaf.it>",
  "eventId": "GRB 100614A"
}