{
  "bibcode": "2006GCN..5544....1E",
  "body": "P. A. Evans (U Leicester), S. D. Barthelmy (GSFC),\nA. P. Beardmore (U Leicester), D. N. Burrows (PSU),\nN. Gehrels (NASA/GSFC), O. Godet (U Leicester),\nC. Guidorzi (Univ Bicocca&INAF-OAB), J. A. Kennea (PSU),\nA. N. Morgan (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL),\nP. Romano (INAF-OAB), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU)\nand H. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:\n\nAt 08:57:22 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 060908 (trigger=228581).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA,Dec 31.835, +0.370 {02h 07m 20s, +00d 22' 14\"} (J2000)\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows 3 overlapping peaks\nstarting at ~T-10 sec and then a 4th peak lasting until T+12 sec. \nThe peak count rate was ~3000 counts/sec (15-350 keV), at ~T+2 sec\nafter the trigger. \n\nThe XRT began observing the field at 08:58:34 UT, 72 seconds after the\nBAT trigger. XRT found a fading and uncatalogued X-ray source\nlocated at RA(J2000) = 02h 07m 18.1s, Dec(J2000) = +00d 20' 29.1\", with an\nestimated uncertainty of 3.8 arcseconds (90% confidence radius). \nThis location is 108 arcseconds from the BAT on-board position, within\nthe BAT error circle. The initial flux in the 2.5s image was\n5.0e-10 erg/cm2/s (0.2-10 keV). \n\nUVOT took a finding chart exposure of 100 seconds with the White\n(160-650 nm) filter starting 80 seconds after the BAT trigger. There\nis a candidate afterglow in the rapidly available 2.7'x2.7' sub-image\nat (RA,DEC) (J2000) of (31.8265,0.3420) or (02h07m18.36s,+00o20'31.2\")\n with a 1-sigma error radius of about 0.7 arc sec. This position is\n3.8 arc sec. from the center of the XRT error circle. The estimated\nmagnitude is 15.1 with a 1-sigma error of about 0.5 mag. No\ncorrection has been made for the expected extinction corresponding to\nE(B-V) of 0.03.",
  "circularId": 5544,
  "createdOn": 1157706982000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 060908: Swift detection of a burst with a bright optical counterpart",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 060908"
}