TITLE: GCN CIRCULAR NUMBER: 12497 SUBJECT: GRB 111026A: Swift detection of a burst DATE: 11/10/26 07:04:53 GMT FROM: Wayne Baumgartner at GSFC W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC), P. A. Evans (U Leicester), C. Guidorzi (U Ferrara), O. M. Littlejohns (U Leicester), C. J. Mountford (U Leicester) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 06:47:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111026A (trigger=506291). A pointing constraint prevented Swift from slewing immediately to the burst. The BAT on-board calculated location is RA, Dec 244.275, -47.495 which is RA(J2000) = 16h 17m 06s Dec(J2000) = -47d 29' 41" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 1.5 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 14:29 UT on 2012 January 12. There will thus be no XRT or UVOT data for this trigger before this time. This burst is only two degrees off the Galactic plane and could be a Galactic transient. Burst Advocate for this burst is W. H. Baumgartner (wayne AT milkyway.gsfc.nasa.gov). 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.)