TITLE: GCN CIRCULAR NUMBER: 27657 SUBJECT: Swift detection of multiple bursts from SGR 1935+2154 DATE: 20/04/27 18:48:14 GMT FROM: David Palmer at LANL S. D. Barthelmy (GSFC), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), T. Sbarrato (INAF-OAB) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 18:26:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located a burst from the Soft Gamma Repeater SGR 1935+2154 (Trigger #968211). Because this is a known source Swift did not automatically slew. The on-board location is RA, Dec 293.735, +21.895 which is RA(J2000) = 19h 34m 56s Dec(J2000) = +21d 53' 43" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single 64 ms bin with a peak count rate of 25k counts/sec (15-350 keV), at the time of the trigger. A second BAT trigger from this source was seen at 18:32:59 (trigger #968212) with comparable intensity. Follow-up observations with Swift are planned.