TITLE: GCN CIRCULAR NUMBER: 23993 SUBJECT: GRB 190324A: Swift detection of a burst DATE: 19/03/24 23:01:38 GMT FROM: Boris Sbarufatti at PSU S. J. LaPorte (PSU), S. D. Barthelmy (GSFC), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), M. J. Moss (George Washington University), B. Sbarufatti (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 22:44:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190324A (trigger=894718). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 49.576, -47.239 which is RA(J2000) = 03h 18m 18s Dec(J2000) = -47d 14' 21" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a precursor at ~T0 and a bright multi-peaked structure starting at ~T+19 s. The total duration is about 40 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~21 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+52.4 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is S. J. LaPorte (extragsam AT gmail.com). 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/)