{
  "bibcode": "2005GCN..3296....1B",
  "body": "L. Barbier (GSFC), D. Palmer (LANL), D. Burrows (PSU), A. Blustin (MSSL),\nC. Markwardt (GSFC/UMd), N. Gehrels (GSFC), P. Roming (PSU)\n\nAt 04:11:52 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated on-board GRB050421 (trigger # 115135).   The BAT on-board\ncalculated location is RA, Dec 307.241, +73.665 (20:28:58, 73:39:54) \n(J2000) with an uncertainty of 4 arcmin (radius, 3-sigma, including estimated\nsystematic uncertainty). The BAT light curve showed a weak, \nmultipeak  structure with a duration of  about 10 seconds. The peak\ncount rate was measured by BAT to be 1000 counts/sec\nin the 15 - 350 keV band.\n\nThe Swift spacecraft slewed promptly onto the BAT position and\nobservations by the Swift X-Ray Telescope (XRT) began at 04:13:42 UT\nwith the XRT in the auto state. An uncatalogued X-ray source was \ndetected at the following position: RA, Dec 307.2542, +73.6528 \n(20:29:01, 73:39:10) (J2000) with an uncertainty of 5\narcsec (radius).  This is 46 arcsec from the BAT position \nreported above.\n\nThe Swift Ultra-Violet/Optical Telescope (UVOT) began observations 112\nseconds after the burst at 04:13:44 UT.  Information on UVOT \nobservations will be published in the next GCN.",
  "circularId": 3296,
  "createdOn": 1114062748000,
  "email": "lmb@cosmicra.gsfc.nasa.gov",
  "subject": "Swift Detection of GRB050421",
  "submitter": "Louis M Barbier at NASA/GSFC/Swift  <lmb@cosmicra.gsfc.nasa.gov>",
  "eventId": "GRB 050421"
}