TITLE: GCN CIRCULAR NUMBER: 16609 SUBJECT: GRB 140719B: Swift detection of a burst DATE: 14/07/19 21:03:42 GMT FROM: Rhaana Starling at U of Leicester R. L. C. Starling (U Leicester), W. H. Baumgartner (GSFC/UMBC), S. B. Cenko (GSFC), L. M. Z. Hagen (PSU), C. J. Mountford (U Leicester), D. M. Palmer (LANL) and T. Sakamoto (AGU) report on behalf of the Swift Team: At 20:49:35.68 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140719B (trigger=605700). Due to a Moon constraint, Swift could not slew to the burst. The BAT on-board calculated location is RA, Dec 39.738d, -2.378d which is RA(J2000) = 02h 38m 57s Dec(J2000) = -02d 22' 39" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 50 sec. The peak count rate was ~900 counts/sec (15-350 keV), at ~2 sec after the trigger. Due to a Moon observing constraint, Swift cannot slew to the BAT position until 06:44 UT on 2014 July 21. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is R. L. C. Starling (rlcs1 AT star.le.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.)