TITLE: GCN CIRCULAR NUMBER: 12413 SUBJECT: GRB 111005A: Swift detection of a burst DATE: 11/10/05 08:23:36 GMT FROM: Scott Barthelmy at NASA/GSFC C. J. Saxton (UCL-MSSL), S. D. Barthelmy (GSFC), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), J. A. Kennea (PSU), O. M. Littlejohns (U Leicester), S. R. Oates (UCL-MSSL), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team: At 08:05:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 111005A (trigger=504779). Swift did not slew because of a Sun observing constraint. The BAT on-board calculated location is RA, Dec 223.284, -19.730 which is RA(J2000) = 14h 53m 08s Dec(J2000) = -19d 43' 48" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 20 sec. The peak count rate was ~1900 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 18:03 UT on 2011 December 25. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is C. J. Saxton (cjs2 AT mssl.ucl.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.)