GCN Circular 26171
E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC), J. A. Kennea (PSU) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team: At 01:36:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located a burst from SGR 1935+2154 (trigger=933285). Swift did not slew due to merit considerations. The BAT on-board calculated location is RA, Dec 293.753, +21.896 which is RA(J2000) = 19h 35m 01s Dec(J2000) = +21d 53' 46" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 0.5 sec. The peak count rate was ~130,000 counts/sec (15-350 keV), at ~0 sec after the trigger. The BAT software is designed to automatically set the trigger of each known source to twice the intensity seen with the previous trigger. Thus, each GCN notice for retriggering on the source indicates a burst at least twice as bright as the previous burst. In this case, the burst is about 7x as bright as reported in GCN 26169. This is the brightest burst seen so far in the the current activation of this source.