{
  "subject": "GRB 060502B: Swift detection of a short burst",
  "eventId": "GRB 060502B",
  "bibcode": "2006GCN..5055....1T",
  "createdOn": 1146593291000,
  "circularId": 5055,
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>",
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "body": "E. Troja (INAF-IASFPA), S. D. Barthelmy (GSFC),\nP. T. Boyd (NASA/GSFC), D. N. Burrows (PSU),\nJ. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC),\nS. T. Holland (GSFC/USRA), S. D. Hunsberger (PSU),\nJ. A. Kennea (PSU), H. A. Krimm (GSFC/USRA),\nV. La Parola (INAF-IASFPA), V. Mangano (INAF-IASFPA),\nF. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nT. Sakamoto (NASA/ORAU), G. Tagliaferri (INAF-OAB) and\nD. E. Vanden Berk (PSU) report on behalf of the Swift Team:\n\nAt 17:24:41 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated the short GRB 060502B (trigger=208275).  Swift slewed immediately\nto the burst.  The BAT on-board calculated location is \nRA,Dec 278.936, +52.632 {18h 35m 45s, +52d 37' 56\"} (J2000)\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The TDRSS BAT light curve shows a single spike\nwith a FWHM of less than 128 msec.  The peak count rate\nwas ~10000 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nThe XRT began taking data at 17:25:51 UT, 70 seconds after the BAT\ntrigger. The XRT on-board centroid algorithm did not find a source in\nthe image, however analysis of downlinked data reveals a faint point\nsource at the following coordinates: RA(J2000) = 18h 35m 45.9s,\nDec(J2000) = 52d 37m 38.1s, with an estimated uncertainty of 10\narcseconds radius (90% containment). This position is 20 arcseconds\nfrom BAT localization. We note that the XRT position lies 2.5\narcseconds from an possible galaxy with R=18.5 in the APM-North\ncatalogue (McMahon et al., 2000). \n\nUVOT took a finding chart exposure of 100 seconds with the White \n(160-650 nm) filter starting 74.2 seconds after the BAT trigger. \nThere is no detected new source in the rapidly available 2.7'x2.7' \nsub-image, to a limiting White magnitude of about 19.1. \n\nWe are currently in the beginning of the Malindi downlink gap, so we\nwill not have the full data set until at least 01:00 03/May/06 UT."
}