TITLE: GCN CIRCULAR NUMBER: 17810 SUBJECT: GRB 150513A: Swift detection of a burst DATE: 15/05/13 20:41:22 GMT FROM: Daniel Kocevski at SLAC D. Kocevski (NASA/GSFC/ORAU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester) and J. L. Racusin (NASA/GSFC) report on behalf of the Swift Team: At 20:31:19 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150513A (trigger=640584). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 49.058, -22.913 which is RA(J2000) = 03h 16m 14s Dec(J2000) = -22d 54' 45" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 140 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~4 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 11:32 UT on 2015 May 28. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is D. Kocevski (dankocevski AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)