TITLE: GCN CIRCULAR NUMBER: 24163 SUBJECT: GRB 190424A: Swift detection of a burst DATE: 19/04/24 10:13:57 GMT FROM: David Palmer at LANL J.D. Gropp (PSU), N. J. Klingler (PSU), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 10:00:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190424A (trigger=900285). Swift did not slew to the burst due to an observing constraint. The BAT on-board calculated location is RA, Dec 48.681, +20.233 which is RA(J2000) = 03h 14m 43s Dec(J2000) = +20d 14' 00" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED peak structure with a duration of about 20 sec. The peak count rate was ~900 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 17:34 UT on 2019 June 30. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is J.D. Gropp (jdg44 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/)