{
  "bibcode": "2008GCN..8349....1R",
  "body": "J. L. Racusin (PSU) reports on behalf of the Swift-XRT team:\n\nWe have analyzed the first 7 orbits of XRT data for GRB 081008 (Racusin et \nal., GCN 8344), including 315 s of WT data and 6.9 ks of PC data.  The \nUVOT-enhanced position was given by Evans et al. (GCN 8347).  The \nresults of the automatic analysis of the XRT data are available at \nhttp://www.swift.ac.uk/xrt_products.\n\nThe 0.3-10.0 keV lightcurve shows three bright flares superimposed on a \nsteep decay, followed by a plateau with a decay index of 0.9 +/- 0.1, \nbreaking at 16 +/- 14 ks to a decay index of 2.0 {+1.8,-0.9}.\n\nThe WT spectrum, for which changes in the hardness ratio during the flares \nsuggests spectral evolution, can be fit by an absorbed power-law, with \nphoton index = 1.81 +/- 0.03 and NH = (6.7 +/- 0.8)e21 cm^-2 at z = 1.967 \n(Cucchiara et al., GCN 8346), in addition to the Galactic value of 7.1e20 \ncm^-2. The observed (unabsorbed) flux over this time (93-408 s after the \ntrigger) is 3.1e-9 (3.9e-9) erg cm^-2 s^-1.\n\nThe PC spectrum can be fit by an absorbed power-law, with photon index = \n1.91 +/- 0.07 and NH = (5.9 {+15.1, -5.9})e20 cm^-2 at z = 1.967, \nconsistent with the Galactic value. The observed (unabsorbed) flux over \nthis time (412 s - 11.9 ks after the trigger) is 3.4e-11 (4.0e-11) erg \ncm^-2 s^-1.\n\nAssuming the X-ray emission continues to decline at the same rate, we \npredict a 0.3-10.0 keV XRT count rate of 3.6e-3 counts/s at T+24hr, which \ncorresponds to an observed (unabsorbed) flux of 1.4e-13 (1.7e-13) ergs \ncm^-2 s^-1.\n\nThis Circular is an official product of the Swift-XRT team.",
  "circularId": 8349,
  "createdOn": 1223564107000,
  "email": "racusin@astro.psu.edu",
  "subject": "GRB 081008: Swift-XRT Refined Analysis",
  "submitter": "Judith Racusin at PSU  <racusin@astro.psu.edu>",
  "eventId": "GRB 081008"
}