{
  "bibcode": "2006GCN..5227....1G",
  "body": "O. Godet, K.L. Page, E. Rol, A.P. Beardmore (U. Leicester), M.J. Page\n(UCL-MSSL) report on behalf of the Swift-XRT team:\n\nWe have analysed the first 5 orbits of X-ray data obtained for GRB\n060605 (BAT trigger 213630).  Using 10.4 ks of Photon Counting (PC) mode\ndata, we find a refined position of:\n\nRA(J2000)  =  21h 28m 37.16s\nDec(J2000) = -06d 03' 33.8\"\n\nwith an uncertainty of 3.6 arcsec (90% containment). This is 0.7 and 2.7\narcsec from the on-board XRT and UVOT positions respectively and 38.8\narcsec from the on-board BAT position given in GCN 5221 by Page et al.\n\nThe source was relatively faint in the XRT. The light-curve shows the\ncommon steep-to-flat-to-steep transition: i) for the first steep\nsegment, alpha_1 = 2.34 +/-0.55 followed by a break at t1 = 171 +/-26s\nafter the BAT trigger (T0); for the shallow decay, alpha_2 = 0.38\n+0.05/-0.06 followed by another break at t2 = T0+5508 + 2029/-904s; iii)\nalpha_3 = 1.23 +0.73/-0.23.\n\nThe first orbit of the WT data (from T0+99s to T0+124s) is well fitted\nby a single power-law with Gamma = 1.6 +0.42/-0.39, with no strong\nevidence for excess NH above the Galactic value of 5.1e20 cm^-2.  The\nspectrum of the PC data from T0+126s to T0+2.4e4s is well fitted by a\nsingle power-law with Gamma = 1.97 +/-0.06, again with no strong\nevidence for excess NH above the Galactic value of 5.1e20 cm^-2. The\nunabsorbed flux in the 0.3-10 keV energy band is 7.5 +0.7/-0.6 e-12 erg\ncm^-2 s^-1. No significant spectral evolution is seen before and after\nthe second break at t2. We note that Khamitov et al. (GCN 5224) claimed\nfor a break in optical between T0+1 and T0+5 hours, which could be\nconsistent with the second break at t2 seen in the XRT light-curve. \n\nAssuming the decay continues to follow the temporal slope alpha_3, the\npredicted count rate at T0+24 hours is 0.010 count s^-1, corresponding\nto an observed (unabsorbed) flux of 4.46e-13 (5.13e-12) erg cm^-2 s^-1.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 5227,
  "createdOn": 1149593405000,
  "email": "og19@star.le.ac.uk",
  "subject": "GRB 060605: Swift-XRT Team refined analysis",
  "submitter": "Olivier Godet at U.of Leicester  <og19@star.le.ac.uk>",
  "eventId": "GRB 060605"
}