{
  "bibcode": "2014GCN.15661....1K",
  "body": "J.A. Kennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU), A.P. Beardmore\n(U. Leicester), P.A. Evans (U. Leicester), B.P. Gompertz (U.\nLeicester), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), P.\nD'Avanzo (INAF-OAB) and L.M.Z. Hagen report on behalf of the Swift-XRT\nteam:\n\nWe have analysed 6.9 ks of XRT data for GRB 140102A (Hagen  et al. GCN\nCirc. 15653),  from 47 s to 25.3 ks after the  BAT trigger. The data\ncomprise 3.0 ks 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 15657).\n\nThe late-time light curve (from T0+5.4 ks) can be modelled with  a\npower-law decay with a decay index of alpha=1.72 (+0.16, -0.14).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.85 (+/-0.03). The\nbest-fitting absorption column is  1.31 (+/-0.09) x 10^21 cm^-2, in\nexcess of the Galactic value of 2.7 x 10^20 cm^-2 (Kalberla et al.\n2005). The PC mode spectrum has a photon index of 1.93 (+0.17, -0.16)\nand a best-fitting absorption column of 9.0 (+4.1, -3.7) x 10^20 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum  is 3.8 x 10^-11 (4.6 x 10^-11) erg cm^-2\ncount^-1. \n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t     9.0 (+4.1, -3.7) x 10^20 cm^-2\nGalactic foreground: 2.7 x 10^20 cm^-2\nExcess significance: 2.8 sigma\nPhoton index:\t     1.93 (+0.17, -0.16)\n\nIf the light curve continues to decay with a power-law decay index of\n1.72, the count rate at T+24 hours will be 6.9 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.6 x\n10^-13 (3.2 x 10^-13) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00582760.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 15661,
  "createdOn": 1388752024000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 140102A: Swift-XRT refined Analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 140102A"
}