{
  "bibcode": "2007GCN..7103....1G",
  "body": "C. Guidorzi, P. Romano (Univ. Bicocca & INAF-OAB),\nA. Moretti (INAF-OAB) and T.N. Ukwatta (GSFC/GWU),\nreport on behalf of the Swift-XRT team:\n\nSwift XRT observed the GRB 071117 (trigger=296805, Ukwatta et al., GCN\nCirc. 7098) beginning 2.8 ks after the BAT trigger.\nIn 4.4 ks of Photon Counting mode data spanning 2.8-14.7 ks after\nthe trigger the position of the X-ray afterglow is\nRA,Dec =335.04579,-63.44278 degrees, which corresponds to\n\nRA(J2000) =  22 20 10.99\nDec(J2000)= -63 26 34.0\n\nwith error circle of radius 3.8 arcsec (90%, including\nboresight uncertainties). This lies 3.6 arcsec from the previous\nXRT position (Romano et al., GCN Circ. 7100) and 32 arcsec from\nthe BAT refined position (Krimm et al., GCN Circ 7102).\n\nThe X-ray light curve can be fit by a power law from\nT+2.8ks to T+14.7ks, with a decay index of 0.8 +/- 0.2.\n\nThe Photon Counting spectrum can modelled with an absorbed power-law, with\na photon index of 2.2 +0.4/-0.3 and a total absorbing column of NH = (2.3\n+0.9/-0.8) e21 cm-2. The Galactic value is 2.3e20 cm-2 in the direction\nof the burst. The 0.3-10 keV observed (unabsorbed) flux during this time\nis 3.0e-12 (5.0e-12) erg cm-2 s-1. Uncertainties are given at 90% \nconfidence.\n\nAssuming the source continues to decay with the same rate,\nwe predict an XRT count rate of 1.3e-2 counts/s at T+24 hours, which\ncorresponds to an observed 0.3-10keV flux of 7.8e-13 ergs cm-2 s-1.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 7103,
  "createdOn": 1195340487000,
  "email": "cristiano.guidorzi@brera.inaf.it",
  "subject": "GRB 071117: Swift-XRT refined analysis",
  "submitter": "Cristiano Guidorzi at INAF-OAB  <cristiano.guidorzi@brera.inaf.it>",
  "eventId": "GRB 071117"
}