{
  "subject": "GRB 070419B: Swift detection of a burst",
  "eventId": "GRB 070419B",
  "bibcode": "2007GCN..6305....1P",
  "createdOn": 1176981125000,
  "circularId": 6305,
  "submitter": "David Burrows at PSU/Swift  <dxb15@psu.edu>",
  "email": "dxb15@psu.edu",
  "body": "A. M. Parsons (GSFC), D. N. Burrows (PSU), M. Capalbi (ASDC),\nP. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Gronwall (PSU),\nC. Guidorzi (Univ Bicocca&INAF-OAB), W. B. Landsman (NASA/GSFC),\nC. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC),\nP. T. O'Brien (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC),\nP. Romano (Univ. Bicocca & INAF-OAB), E. Troja (INAF-IASFPA) and\nH. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:\n\nAt 10:44:05 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 070419B (trigger=276212).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 315.719, -31.267 which is \n   RA(J2000) = 21h 02m 52s\n   Dec(J2000) = -31d 15' 59\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows multiple peaks,\nwith a duration of about 160 seconds. The peak count rate was \n~2500 counts/sec (15-350 keV), at ~0 sec after the trigger.  \nWe note that this burst is distinct from GRB 070419A (trigger 276206). \n\nThe XRT began observing the field at 10:45:26 UT, 81 seconds after the\nBAT trigger. XRT found a bright, fading and uncatalogued X-ray source\nlocated at RA, Dec 315.7067, -31.2635 which is\n   RA(J2000)  =  21h 02m 49.6s\n   Dec(J2000) = -31d 15' 48.6\"\nwith an uncertainty of 5 arcseconds (radius, 90% containment). \nThis location is 40 arcseconds from the BAT on-board position,\nwithin the BAT error circle. The initial flux in the 2.5s image\nwas 1.5e-08 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 89 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 18.5 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 extinction."
}