TITLE: GCN CIRCULAR NUMBER: 32154 SUBJECT: Trigger 1108538: Swift detection of a burst from SGR J1935+2154 DATE: 22/05/30 20:49:17 GMT FROM: David Palmer at LANL A. Y. Lien (U Tampa), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 20:32:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located SGR J1935+2154 (trigger=1108538). The BAT on-board calculated location is RA, Dec 293.714, +21.901 which is RA(J2000) = 19h 34m 51s Dec(J2000) = +21d 54' 04" 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 0.3 sec. The peak count rate was ~110,000 counts/sec (on a 64 ms timescale, 15-350 keV), at ~0 sec after the trigger. An XRT and UVOT observation of SGR J1935+2154 is scheduled for 21:50-22:18 UT (target ID 33349). This source was last seen to be active by BAT in a series of at least 36 bursts during the period Jan 9-18, 2022.