{
  "bibcode": "2007GCN..6005....1K",
  "body": "H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), M. M. Chester (PSU),\nG. Cusumano (INAF-IASFPA), P. A. Evans (U Leicester),\nN. Gehrels (NASA/GSFC), C. B. Markwardt (GSFC/UMD),\nT. Mineo (INAF-IASFPA), K. L. Page (U Leicester),\nD. M. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB),\nB. Sbarufatti (INAF-IASFPA), M. Stamatikos (NASA/ORAU) and\nR. L. C. Starling (U Leicester) report on behalf of the Swift Team:\n\nAt 07:22:41 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 070110 (trigger=255445).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 0.910, -52.961 which is \n   RA(J2000)  =  00h 03m 38s\n   Dec(J2000) = -52d 57' 39\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows a multi-peaked\nstructure with a duration of about 70 sec.  The peak count rate\nwas ~1000 counts/sec (15-350 keV), at ~18 sec after the trigger. \n\nThe XRT began observing the field at 07:24:15 UT, 93 seconds after the\nBAT trigger. XRT found a bright, variable, uncatalogued X-ray source\nlocated at RA(J2000) = 00h 03m 39.6s, Dec(J2000) = -52d 58' 29.1\", with an\nestimated uncertainty of 4.2 arcseconds (90% confidence radius). \nThis is a ground calculated position based on prompt downlinked data. \nThis location is 52 arcseconds from the BAT on-board position, within\nthe BAT error circle. The initial flux in the 2.5s image was\n2.1e-09 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 104 seconds after the BAT trigger. An\nafterglow candidate is apparent at RA=0.9133 (00h 03m 39.20s),\nDEC=-52.9740 (-52d 58' 26.3\") with an estimated uncertainty of � 1\narcsec, which is 4.6\" from the XRT position. The estimated magnitude\nis 20.9 (white), with an uncertainty of � 1 mag. Additional data\nproducts are not yet available to confirm the candidate. The\n2.7'x2.7' sub-image covers 100% of the XRT error circle. No\ncorrection has been made for the expected extinction corresponding to\nE(B-V) of 0.014.",
  "circularId": 6005,
  "createdOn": 1168415832000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 070110: Swift detection of a burst with a possible optical afterglow",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 070110"
}