{
  "bibcode": "2006GCN..4745....1P",
  "body": "K.L. Page, E. Rol, A.P. Beardmore (U Leicester) and A.J. Levan (U.  \nHertfordshire) report on behalf of the Swift XRT team:\n\nAnalysing the first three orbits of data (28 s in Windowed Timing mode and\n6.4 ks in Photon Counting mode), the following refined position for the\nX-ray afterglow was determined:\n\nRA(J2000) =   05h 00m 17.2s\nDec(J2000) = +14d 56' 58.9\"\n\nwith an estimated uncertainty of 3.9 arcsec (90% containment). This is \n31.6 arcsec from the on-board BAT position reported in GCN 4739 and 1.9 \narcsec from the XRT position given in GCN 4743.\n\nThe light-curve shows a steep initial decay of 2.09 +/- 0.23, flattening\nto a slope of 0.62 +/- 0.23 towards the end of the first orbit (at 811 +/-\n373 seconds after the trigger).\n\nThe spectrum obtained for the first orbit of data (118 - 2380 s\npost-trigger) can be fitted with a power-law of photon index Gamma = 1.54\n+/- 0.27, assuming a Galactic column of 1.9e21 cm^-2; there is no evidence\nfor excess NH in these data. Over this time span, the mean 0.3-10 keV\nobserved (unabsorbed) flux is 4.1e-12 (4.9e-12) erg cm^-2 s^-1.\n\nAssuming the current decay slope of 0.62 continues, and using the spectral\nfit to the first orbit of data, the XRT count rate is predicted to be\n0.002 at 24 hours, corresponding to an observed (unabsorbed) flux of\n8.0e-14 (9.7e-14) erg cm^-2 s^-1. However, taking into account the\nuncertainty in the decay slope, the observed flux at 24 hours could range\nbetween (0.3 - 2.4)e-13 erg cm^-2 s^-1.\n\nThis circular is an official product of the Swift-XRT Team.",
  "circularId": 4745,
  "createdOn": 1139698350000,
  "email": "kpa@star.le.ac.uk",
  "subject": "GRB 060211B: Swift-XRT Team refined analysis",
  "submitter": "Kim Page at U.of Leicester  <kpa@star.le.ac.uk>",
  "eventId": "GRB 060211B"
}