TITLE: GCN CIRCULAR NUMBER: 11294 SUBJECT: GRB 100924A: Swift detection of a burst DATE: 10/09/24 04:16:37 GMT FROM: Vanessa Mangano at INAF-IASFPA V. Mangano (INAF-IASFPA), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), E. A. Hoversten (PSU), C. B. Markwardt (NASA/GSFC) and B. Sbarufatti (INAF-OAB/IASFPA) report on behalf of the Swift Team: At 03:58:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100924A (trigger=434843). Swift did not slew to the burst. The BAT on-board calculated location is RA, Dec 0.671, +7.015 which is RA(J2000) = 00h 02m 41s Dec(J2000) = +07d 00' 54" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 90 sec. The peak count rate was ~5457 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to an Moon observing constraint, Swift cannot slew to the BAT position until 13:21 UT on 2010 September 25. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is V. Mangano (vanessa AT ifc.inaf.it). 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.)