{
  "bibcode": "2008GCN..7208....1M",
  "body": "V. Mangano, B. Sbarufatti (INAF-IASF PA), T. N. Ukwatta (GSFC/GWU),\nand D. N. Burrows (PSU) report on behalf of the Swift XRT team:\n\nWe have analyzed the XRT data collected during the first three\norbits of observation of GRB 080123 (Ukwatta et al., GCN Circ. 7203).\nWe have 124 s of exposure in WT mode (from T+108 to T+224 s)\nand 7.1 ks in PC mode.\n\nThe initial XRT on-board position was centered on a cosmic ray hit. \nThis position was retracted.  The XRT position reported in GCN Circ. \n7203 was obtained from the first downlinked data, but we note that the \nerror circle given in this circular erroneously  ignored the systematic \ncomponent and was therefore much too small.  The new, refined position \nof the XRT afterglow is\n\n22h 35m 46.6s, -64d 54' 03.8\" (J2000)\n\nwith an error circle radius of 3.9\" (90% confidence).\nAs reported by Osborne et al. (GCN Circ. 7204), the UVOT-enhanced\nastrometric position is RA, Dec = 338.94226, -64.90090 which is\nequivalent to:\n\nRA (J2000):   22h 35m 46.1s\nDec (J2000): -64d 54' 03.24\"\n\nwith an uncertainty of 2.1 arcsec (radius, 90% confidence).\n\nThe X-ray light curve of the source shows a doubly broken\npower law behaviour, with an initial decay with slope 1.7 +/- 0.2,\na first break at T+203 +/- 10 s, a second decay phase with\nslope 6.9 +/- 0.4, a second break at T+436 +/- 250 s\nand a third decay phase with slope 1.2 +/- 0.3.\nIf decaying at this rate the source will be at the level of\n9.0e-5 counts/s at T+24 hr.\n\nThe WT spectrum is well fitted by an absorbed power law with\nphoton index 1.64 +/- 0.09, while the PC spectrum can be\nfitted by a power law with photon index of 2.1 +/- 0.2.\nBoth spectra are consistent with an absorption column\nof (8.1 +/- 2.4)e20 cm^-2, in excess with respect to the\nGalactic absorption along the line of sight (2e20 cm^-2,\nKalberla et al. 2005).\nThe observed (unabsorbed) flux in the 0.3-10 keV band\nis 7.0e-10 (7.9e-10) erg cm^-2 s^-1 for the WT spectrum\nand 1.1e-12 (1.4e-12) erg cm^-2 s^-1 for the PC spectrum.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 7208,
  "createdOn": 1201109082000,
  "email": "sbarufatti@ifc.inaf.it",
  "subject": "GRB 080123: Swift-XRT refined analysis",
  "submitter": "Boris Sbarufatti at INAF-IASF-Pa  <sbarufatti@ifc.inaf.it>",
  "eventId": "GRB 080123"
}