{
  "bibcode": "2006GCN..5528....1R",
  "body": "J. L. Racusin (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU),\nN. Gehrels (NASA/GSFC), C. Guidorzi (Univ Bicocca&INAF-OAB),\nS. D. Hunsberger (PSU), V. Mangano (INAF-IASFPA), D. C. Morris (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL), E. Rol (U Leicester),\nP. Romano (INAF-OAB), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU)\nand H. Z. Ziaeepour (UCL-MSSL) report on behalf of the Swift Team:\n\nAt 08:32:46 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 060906 (trigger=228316).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA,Dec 40.748, +30.349 {02h 42m 60s, +30d 20' 58\"} (J2000)\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve is complicated by the fact\nthat the spacecraft was slewing just prior to the image trigger.  There\nappears to be an ~5 sec wide peak starting at T_zero.  There are possibly\ntwo smaller peaks at T-15 and T-21 sec, but these are during the slew\nand may be caused by the slew.  The peak count rate\nis ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger. \n\nThe XRT began taking data at 08:35:15 UT, 148 seconds after the BAT\ntrigger. The XRT on-board centroid algorithm did not find a source in\nthe image but ground analysis of 5 seconds of flight data available \nat this time reveals a possible faint source at the following coordinates:   \nRA(J2000): 2h 43m 00.9s\nDec(J2000): +30 21 38.95   \nwith an error of 8 arcseconds (90% confidence). Further analysis of \nground data is necessary to determine the properties of the possible\nsource. \n\nUVOT took a finding chart exposure of 100 seconds with the White\n(160-650 nm) filter starting 152 seconds after the BAT trigger. No\nafterglow candidate has been found in the initial data products. The\n2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical\n3-sigma upper limit has been about 18.5 mag. The 8'x8' region for the\nlist of sources generated on-board covers 100% of the BAT error\ncircle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to\nE(B-V) of  0.20. \n\nWe will have the full data set downlinked and processed by ~11:00 UT.",
  "circularId": 5528,
  "createdOn": 1157533968000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 060906: Swift detection of a probable burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 060906"
}