{
  "bibcode": "2008GCN..8500....1I",
  "body": "S. Immler (CRESST/GSFC/UMD), A. P. Beardmore (U Leicester),\nJ. R. Cummings (NASA/UMBC), P. A. Evans (U Leicester),\nN. Gehrels (NASA/GSFC), S. D. Hunsberger (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nM. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester),\nT. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the\nSwift Team:\n\nAt 07:02:06 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 081109 (trigger=334112).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 330.787, -54.719 which is \n   RA(J2000) = 22h 03m 09s\n   Dec(J2000) = -54d 43' 06\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a triangular\nstructure with a duration of about 40 sec.  The peak count rate\nwas ~2500 counts/sec (15-350 keV), at 20 sec after the trigger. \n\nThe XRT began observing the field at 07:03:12.2 UT, 65.6 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 330.7911, -54.7114 which is equivalent to:\n   RA(J2000)  = 22h 03m 09.86s\n   Dec(J2000) = -54d 42' 41.0\"\nwith an uncertainty of 4.8 arcseconds (radius, 90% containment). This\nlocation is 28 arcseconds from the BAT onboard position, within the BAT\nerror circle. No event data are yet available to determine the column\ndensity using X-ray spectroscopy. \n\nThe initial flux in the 2.5 s image was 4.78e-09 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 75 seconds after the BAT trigger. The 2.7'x2.7' sub-image covers 100%\nof the XRT error circle. The typical 3-sigma upper limit has been about 19.6\nmag. The 8'x8' region for the list of sources generated on-board covers 100% of\nthe XRT error circle. The list of sources is typically complete to about 18\nmag. No correction has been made for the expected extinction corresponding to\nE(B-V) of 0.02. No afterglow candidate has been detected. \n\nBurst Advocate for this burst is S. Immler (immler AT milkyway.gsfc.nasa.gov). \nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/too.html.)",
  "circularId": 8500,
  "createdOn": 1226215379000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 081109: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 081109"
}