{
  "bibcode": "2006GCN..5966....1G",
  "body": "D. Grupe (PSU) reports on behalf of the Swift/XRT team\n\n\n\nWe have analyzed the first orbit of GRB 061222A (Grupe et al., GCN 5954)\nwith total observing times of 117s in Windowed Timing mode and\n1476s in Photon Counting mode in the Swift XRT. The Photon Counting mode \nimage\nprovides a refined XRT position at RA, Dec= 358.263708, +46.53297, which is\n\nRA(J2000) = 23h 53m 03.29s\nDec(J2000) = +46d 31' 58.7\"\n\nwith an error of 3.5\" (90% confidence). This position is 2.4\"\naway from the preliminary XRT position reported in GCN 5954.\n\nThe X-ray light curve displays the end of a flare as seen in the BAT (at \nthe beginning of the\nXRT observation this flare had an initial count rate of about 100 \ncounts/s) and decays\nwith a slope of 0.26+/-0.03.\n\nSpectral fits to the Windowed Timing mode data show an\nabsorption column density  significantly in excess of the Galactic value \n(1.01e21 cm**-2)\nwith an excess absorption column density of (3.7+/-0.3)e21 cm**-2 and a \nenergy spectral\nslope beta-x=1.34+/-0.08. Following the relation given in Grupe et al. \n2006 (AJ submitted,\nastro-ph/0612104) the high excess absorption column density suggests \nthat this\nburst is at a redshift z<3.0.\n\nEven though the observations were shortly interrupted by a new burst, \nGRB 06122B\n(Racusin et al., GCN 5957), we continue observing GRB 061222A with Swift\nthroughout the next hours. More analysis of the data will be presented \nin the\nGCN report.\n\nThis circular is an official product of the Swift XRT team.",
  "circularId": 5966,
  "createdOn": 1166771500000,
  "email": "grupe@astro.psu.edu",
  "subject": "GRB 061222A: Swift-XRT refined analysis",
  "submitter": "Dirk Grupe at PSU/Swift-XRT  <grupe@astro.psu.edu>",
  "eventId": "GRB 061222A"
}