TITLE: GCN CIRCULAR NUMBER: 15929 SUBJECT: GRB 140305A: Swift detection of a burst DATE: 14/03/05 15:07:40 GMT FROM: Scott Barthelmy at NASA/GSFC A. Maselli (INAF-IASFPA), S. D. Barthelmy (GSFC), P. A. Evans (U Leicester), S. T. Holland (STScI), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester), P. Romano (INAF-IASFPA) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 15:00:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140305A (trigger=590446). Swift did not slew to this burst because of the Sun constraint. The BAT on-board calculated location is RA, Dec 344.533, +15.441, which is RA(J2000) = 22h 58m 08s Dec(J2000) = +15d 26' 29" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a cluster of peaks with a total duration of about 25 sec. The peak count rate was ~1700 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 16:35 UT on 2014 April 25. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is A. Maselli (maselli 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.)