TITLE: GCN CIRCULAR NUMBER: 19279 SUBJECT: GRB 160411A: Swift detection of a short burst DATE: 16/04/11 01:37:41 GMT FROM: David Palmer at LANL K. L. Page (U Leicester), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 01:28:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160411A (trigger=682339). Swift could not immediately slew to the burst due to an observing constraint. The BAT on-board calculated location is RA, Dec 349.362, -40.271 which is RA(J2000) = 23h 17m 27s Dec(J2000) = -40d 16' 14" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.5 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0.2 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+50.4 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is K. L. Page (klp5 AT leicester.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.)