TITLE: GCN CIRCULAR NUMBER: 13645 SUBJECT: GRB 120815A: Swift detection of a burst DATE: 12/08/15 02:24:12 GMT FROM: Scott Barthelmy at NASA/GSFC C. Pagani (U Leicester), S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team: At 02:13:58 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120815A (trigger=531003). Swift will execute a delayed slew due to Earth-limb observing constraint. The BAT on-board calculated location is RA, Dec 273.955, -52.134, which is RA(J2000) = 18h 15m 49s Dec(J2000) = -52d 08' 02" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single pulse with a duration of about 10 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+40.6 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is C. Pagani (cp232 AT star.le.ac.uk). 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.)