TITLE: GCN CIRCULAR NUMBER: 12310 SUBJECT: GRB 110827A: Swift detection of a burst DATE: 11/08/27 00:11:29 GMT FROM: David Palmer at LANL B.-B. Zhang (PSU), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU), D. Grupe (PSU), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 00:01:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110827A (trigger=501520). Swift could not slew to this burst due to the Sun constraint. The BAT on-board calculated location is RA, Dec 164.095, +53.787 which is RA(J2000) = 10h 56m 23s Dec(J2000) = +53d 47' 13" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 2011 September 05. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is B.-B. Zhang (bbzhang AT 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.)