{
  "bibcode": "2008GCN..7605....1E",
  "body": "P.A. Evans, K.L. Page, A.P. Beardmore, R.L.C. Starling (U. Leicester)\nand F.E. Marshall (NASA/GSFC) report on behalf of the Swift-XRT team:\n\nWe have analysed 5.2 ks of Swift XRT data for GRB 080413A (Beardmore et\nal. GCN Circ. 7594), from T0+67 s to T0+21000 s. The first 186 s of data\nwere obtained in Windowed Timing (WT mode); the remainder in Photon\nCounting mode. The best XRT position for this object is the\nUVOT-enhanced position given in Osborne et al. (GCN Circ. 7596).\n\nThe X-ray light curve is well fitted by a power-law decay, with an\ninitial decay slope of 2.87 (+/- 0.19) up to T0+175 (+23/-16) s, at\nwhich point the decay shallows to a slope of 1.10 (+0.06/-0.07).\n\nA spectrum obtained from all of the WT mode data can be modelled with an\nabsorbed power-law with a photon index gamma=3.12 (+0.16/-0.15). A\nredshifted absorbing column of 1.53 (+0.43/-0.38) x 10^22 cm^-2, at a\nredshift of z=2.433 (Thoene et al. GCN Circ 7602) is necessary in\naddition to the Galactic column of 8.71 x 10^20 cm^-2 (Kalberla et al.\n2005). The observed (unabsorbed) 0.3-10 keV flux in this spectrum is\n4.1 x 10^-10 (1.71 x 10^-9) erg cm^-2 s^-1.\n\nIf the source continues to decay at the present rate, we predict a count\nrate of 3.51 x 10^-3 count/sec at T0+24 hours, which correponds to a\n0.3-10 keV observed (unabsorbed) flux of 9.54 x 10^-14 (2.72 x 10^-13)\nerg cms^-2 s^-1.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 7605,
  "createdOn": 1208104742000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 080413A: Swift-XRT refined analysis",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 080413A"
}