{
  "bibcode": "2007GCN..7045....1P",
  "body": "K.L. Page (U Leicester) reports on behalf of the Swift-XRT Team:\n\nSeven orbits (15.6 ks) of Swift-XRT data have now been obtained and \nanalysed for the SuperAGILE burst GRB 071104 (Donnarumma et al., GCN Circ \n7042), all in Photon Counting mode. The XRT position was given in GCN \nCirc. 7043 and has not been further improved.\n\nAlthough the X-ray light-curve can, to first order, be fitted by a single \npower-law, there is an indication that the decay has broken (around 43 ks \nafter the trigger) from an initial slope of alpha ~ 0.6 to a steeper \nvalue of ~2.9, although this decay slope is not well-constrained because \nof the limited data after the break time (a 90% range of alpha = 0.5 - 5.3 \nis estimated).\n\nA spectrum formed from all the data (20.5 - 50.9 ks after the trigger) can \nbe modelled with a power-law of Gamma = 1.9 +/- 0.3 absorbed by the \nGalactic column density of 2.69e21 cm^-2. (The 90% upper limit on this \nabsorption is 4.9e21 cm^-2.) Over this period, the 0.3-10 keV observed \nflux is 1.1e-12 erg cm^-2 s^-1, with the unabsorbed value being 1.5e-12 \nerg cm^-2 s^-1.\n\nUsing the range of possible decay slopes, the count-rate is expected to be \nbetween 0.018 and 7e-4 count s^-1 at 24 hours, corresponding to an \nobserved flux range of between 1.0e-12 and 4.0e-14 erg cm^-2 s^-1 over \n0.3-10 keV (1.4e-12 - 5.4e-14 erg cm^-2 s^-1 unabsorbed).\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 7045,
  "createdOn": 1194250555000,
  "email": "kpa@star.le.ac.uk",
  "subject": "GRB 071104: Swift-XRT Team Refined Analysis",
  "submitter": "Kim Page at U.of Leicester  <kpa@star.le.ac.uk>",
  "eventId": "GRB 071104"
}