{
  "bibcode": "2006GCN..5641....1T",
  "body": "E. Troja (INAF-IASFPa), K. L. Page (U. Leicester), D. Burrows (PSU) and L.\nM. Barbier (NASA/GSFC) report on behalf of the Swift/XRT team:\n\nWe have analysed the first three orbits of Swift data of GRB 060927\n(Barbier et al., GCN 5627). The XRT data set consists of 4 ks in Photon\nCounting mode (PC).\n\nWe derived a refined XRT position of\n\nRA(J2000)   =  21h 58m 12.2s\nDec(J2000)  = +05d  21' 52.2''\n\nwith an error of 6\" (90% confidence, including boresight uncertainties).\nThis position is within 1.8\" of the initial XRT position, and 4.6\" from\nthe optical afterglow candidate, reported in GCN 5629 (Schaefer et al.).\n\nThe lightcurve shows a break at 4 ks after the trigger. The decay before\nthe break is 0.7 steepening to 1.4 at later times. The spectrum can be\nmodelled with an absorbed power-law with a spectral index of 1.96+/-0.2\nand a column density of 8+/-3 e20 cm^-2. The Galactic absorption in this\ndirection is 5.2e20 cm^-2.\n\nThe average unabsorbed flux for the first three orbits is 5.6e-12 ergs\ncm^-2 s^-1. At this decay rate we predict a count rate of 1.2e-3 cts/s at\nT+24h, corresponding to an unabsorbed flux of 7.2e-14 ergs cm^-2 s^-1.\n\nThis circular is an official product of the Swift XRT Team.",
  "circularId": 5641,
  "createdOn": 1159399146000,
  "email": "kpa@star.le.ac.uk",
  "subject": "GRB 060927: Swift XRT Team refined analysis",
  "submitter": "Kim Page at U.of Leicester  <kpa@star.le.ac.uk>",
  "eventId": "GRB 060927"
}