{
  "bibcode": "2008GCN..7594....1B",
  "body": "A. P. Beardmore (U Leicester), D. N. Burrows (PSU),\nP. A. Evans (U Leicester), N. Gehrels (NASA/GSFC),\nS. T. Holland (CRESST/USRA/GSFC), S. D. Hunsberger (PSU),\nJ. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nT. Sakamoto (NASA/UMBC), M. Stamatikos (NASA/ORAU) and\nE. Troja (U Leicester/INAF-IASFPA) report on behalf of the Swift\nTeam:\n\nAt 02:54:19 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 080413 (trigger=309096).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 287.290, -27.679 which is \n   RA(J2000) = 19h 09m 10s\n   Dec(J2000) = -27d 40' 44\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a triple-peaked\nstructure with a duration of about 55 sec.  The peak count rate\nwas ~10000 counts/sec (15-350 keV), at ~1 sec after the trigger. \n\nThe XRT began observing the field at 02:55:20.0 UT, 60.7 seconds after\nthe BAT trigger. XRT found a bright, fading uncatalogued X-ray source\nlocated at RA, Dec 287.2978, -27.6779 which is equivalent to:\n   RA(J2000)  = 19h 09m 11.4s\n   Dec(J2000) = -27d 40' 40.4\"\nwith an uncertainty of 4.7 arcseconds (radius, 90% containment). This\nlocation is 25 arcseconds from the BAT onboard position, within the BAT\nerror circle. No event data are yet available to assess possible\nredshift constraints using X-ray spectroscopy and the nH-z relation\nfrom Grupe et al. (2007). \n\n\nUVOT took a finding chart exposure of 100 seconds with the White (160-650 nm)\nfilter starting 76 seconds after the BAT trigger. There is a candidate\nafterglow in the rapidly available 2.7'x2.7' sub-image at\n  RA(J2000)  =\t19:09:11.76 = 287.2990\n  DEC(J2000) = -27:40:40.1  = -27.6778\nwith a 1-sigma error radius of about 0.6 arc sec. This position is 3.9 arc sec. \nfrom the center of the XRT error circle. The estimated magnitude is 15.2 with a\n1-sigma error of about 0.5 mag. No correction has been made for the expected\nextinction corresponding to E(B-V) of 0.16.",
  "circularId": 7594,
  "createdOn": 1208056013000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 080413: Swift detection of a burst with an optical afterglow",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 080413"
}