{
  "bibcode": "2006GCN..5691....1Z",
  "body": "H. Ziaeepour (UCL-MSSL), D. N. Burrows (PSU),\nJ. R. Cummings (NASA/UMBC), S. R. Oates (UCL-MSSL), C. Pagani (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL), G. Sato (GSFC/ISAS),\nM. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester) and\nD. E. Vanden Berk (PSU) report on behalf of the Swift Team:\n\nAt 19:50:30 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 061004 (trigger=232339).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA,Dec 97.748, -45.894 {06h 30m 60s, -45d 53' 36\"} (J2000)\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a peak\nwith a duration of about 6 sec.  The peak count rate\nwas ~5000 counts/sec (15-350 keV), at ~3 sec after the trigger. \n\nThe XRT began observing the field at 19:51:30 UT, 60 seconds after the\nBAT trigger. XRT found a bright, variable, uncatalogued X-ray source\nlocated at RA(J2000) = 06h 31m 10.52s, Dec(J2000) = -45d 54' 24.0\", with an\nestimated uncertainty of 6 arcseconds (90% confidence radius). \nThis location is 124 arcseconds from the BAT on-board position, within\nthe BAT error circle. The initial flux in the 2.5s image was\n4.6e-10 erg/cm2/s (0.2-10 keV). \n\nUVOT took a finding chart exposure of 100 seconds with the White (160-650 nm)\nfilter starting 69 seconds after the BAT trigger. No afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 18.0 mag. \nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of 0.049",
  "circularId": 5691,
  "createdOn": 1159992730000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 061004: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 061004"
}