TITLE: GCN CIRCULAR NUMBER: 12518 SUBJECT: GRB 111103A: Swift detection of a burst DATE: 11/11/03 10:54:18 GMT FROM: David Palmer at LANL M. C. Stroh (PSU), W. H. Baumgartner (GSFC/UMBC), S. Campana (INAF-OAB), P. A. Evans (U Leicester), E. A. Hoversten (PSU), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/IASFPA) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team: At 10:35:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111103A (trigger=506902). The BAT on-board calculated location is RA, Dec 327.122, -10.547 which is RA(J2000) = 21h 48m 29s Dec(J2000) = -10d 32' 49" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peaked structure with a duration of about 20 sec. The peak count rate was ~4800 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Moon observing constraint, Swift cannot slew to the BAT position until 20:12 UT on 2011 November 05. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is M. C. Stroh (stroh AT astroh.org). 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.)