TITLE: GCN CIRCULAR NUMBER: 19029 SUBJECT: GRB 160220B: Swift detection of a burst DATE: 16/02/20 11:22:29 GMT FROM: Kim Page at U.of Leicester J. R. Cummings (NASA/UMBC), A. Y. Lien (GSFC/UMBC), D. Malesani (DARK/NBI) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 11:10:53 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160220B (trigger=674734). Swift did not slew immediately due to an observing constraint. The BAT on-board calculated location is RA, Dec 259.854, -18.123 which is RA(J2000) = 17h 19m 25s Dec(J2000) = -18d 07' 22" 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 30 sec. The peak count rate was ~6000 counts/sec (15-350 keV), at ~6 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+46.5 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). 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.)