TITLE:   GCN CIRCULAR
NUMBER:  3138
SUBJECT: Swift-BAT detection of a bright outburst from SGR1806-20
DATE:    05/03/23 03:31:54 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>

S. Barthelmy, L. Barbier (GSFC), J. Cummings (GSFC/NRA),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS),
M. Suzuki (Saitama), J. Tueller (GSFC)
on behalf of the Swift-BAT team:

At 02:38:21.10 2005-03-23 UT Swift-BAT triggered on a bright outburst
from SGR1806-20.  There were two short peaks each ~0.4 sec
in duration, each with a peak count rate of ~160,000 counts/sec.
There was a smaller pre-trigger peak of ~30,000 counts/sec
at T-0.7 sec.  More than 99% of the emission is below 100 keV.