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GCN Circular 27657

Subject

Swift detection of multiple bursts from SGR 1935+2154

Date

2020-04-27T18:48:14Z (5 years ago)

From

David Palmer at LANL <palmer@lanl.gov>

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.