TITLE: GCN CIRCULAR NUMBER: 22612 SUBJECT: GRB 180407A: Swift detection of a burst DATE: 18/04/07 02:04:34 GMT FROM: David Palmer at LANL A. Deich (PSU), C. Gronwall (PSU), S. J. LaPorte (PSU), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 01:54:49 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180407A (trigger=823001). Swift could not slew to the location due to an observing constraint. The BAT on-board calculated location is RA, Dec 35.241, +33.499 which is RA(J2000) = 02h 20m 58s Dec(J2000) = +33d 29' 56" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure structure with a duration of about 70 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~0 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 12:55 UT on 2018 June 19. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is A. Deich (aud375 AT psu.edu). 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.)