{
  "bibcode": "2010GCN.10916....1S",
  "body": "M. H. Siegel (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU),\nJ. M. Gelbord (PSU), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC),\nJ. A. Kennea (PSU), D. M. Palmer (LANL) and T. N. Ukwatta (GSFC/GWU)\nreport on behalf of the Swift Team:\n\nAt 01:03:47 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 100702A (trigger=426438).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 245.702, -56.538 which is \n   RA(J2000) = 16h 22m 49s\n   Dec(J2000) = -56d 32' 15\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a single peak\nwith a duration of about 0.3 sec.  The peak count rate\nwas ~11000 counts/sec (15-350 keV), at ~0.2 sec after the trigger. \n\nThe XRT began observing the field at 01:05:21.1 UT, 93.9 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nfading, uncatalogued X-ray source with an enhanced position: RA, Dec\n245.6969, -56.5316 which is equivalent to:\n   RA(J2000)  = 16h 22m 47.26s\n   Dec(J2000) = -56d 31' 53.8\"\nwith an uncertainty of 2.4 arcseconds (radius, 90% containment). This\nlocation is 24 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at http://www.swift.ac.uk/sper. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of\n2.84e+21 cm^-2 (Kalberla et al. 2005). \n\nThe initial flux in the 2.5 s image was 9.31e-10 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 150 seconds with the White\nfilter  starting 101 seconds after the BAT trigger. The 2.7'x2.7'\nsub-image covers 100% of the XRT error circle. A known source from the\nDSS is within the XRT error circle. However, because of the density of\ncatalogued stars, further  analysis is required to determine if this\nis the GRB host, afterglow or an unrelated background source. The\ncoverage of the XRT error circle by the 8'x8' region for the  list of\nsources generated on-board is uncertain because the large number of \nsources filled the available telemetry. Because of the density of\ncatalogued  stars, further analysis is required to report an upper\nlimit for any afterglow  in the region. No correction has been made\nfor the large, but uncertain  extinction expected. \n\nBurst Advocate for this burst is M. H. Siegel (siegel AT astro.psu.edu). \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": 10916,
  "createdOn": 1278033800000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 100702A: Swift detection of a short burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 100702A"
}