TITLE: GCN CIRCULAR NUMBER: 12394 SUBJECT: GRB 110928A: Swift detection of a burst DATE: 11/09/28 02:03:46 GMT FROM: Scott Barthelmy at NASA/GSFC E. A. Hoversten (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and E. Sonbas (GSFC/USRA/Adiyaman Univ.) report on behalf of the Swift Team: At 01:51:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110928A (trigger=504215). Swift will slew after 52 minutes after the Earth limb constraint is avoided. The BAT on-board calculated location is RA, Dec 257.755, +36.570, which is RA(J2000) = 17h 11m 01s Dec(J2000) = +36d 34' 13" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single FRED-like pulse with a duration of about 10 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+52 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is E. A. Hoversten (hoversten AT astro.psu.edu). 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.)