{
  "bibcode": "2015GCN.18215....1M",
  "body": "F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC),\nA. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) and T. Sakamoto (AGU)\nreport on behalf of the Swift Team:\n\nAt 22:19:27 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 150831B (trigger=653978).  Swift did not slew due to observing\nconstraint.  The BAT on-board calculated location is \nRA, Dec 271.021, -27.252, which is \n   RA(J2000)  =  18h 04m 05s\n   Dec(J2000) = -27d 15' 07\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows a couple of overlapping peaks\nstructure with a total duration of about 3 sec.  The peak count rate\nwas ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nDue to an observing constraint, Swift will not slew until T0+49.6\nminutes. There will be no XRT or UVOT data until this time. \n\nWe note that this source is in the projected direction of the \nGalactic bulge (lon,lat = 3.51,-2.66) and for that reason there \nis a strong possibility that this is a Galactic source.  However, its\nlight curve and the presence of flux above 100 keV are more consistent \nwith a cosmological GRB. \n\nDetermination of the nature of this event will require XRT observations\nand the full downlinked dataset. \n\nBurst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.nasa.gov). \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": 18215,
  "createdOn": 1441060444000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "GRB 150831B: Swift detection of a probable burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 150831B"
}