TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3002
SUBJECT: SGR1806-20: Swift-BAT detection of a large normal burst
DATE:    05/01/30 23:52:20 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>

G. Sato (ISAS), L. Antonelli (INAF-OAR), S. Barthelmy, L. Barbier (GSFC),
M. Cropper (MSSL), J. Cummings (GSFC), E. Fenimore (LANL), R. Fink (GSFC),
M. Galassi (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), P. Meszaros (PSU),
K. McLean (LANL), D. Palmer (LANL), A. Parsons, T. Sakamoto (GSFC),
M. Suzuki (Saitama), J. Tueller (GSFC)  on behalf of the Swift-BAT team:


Swift-BAT triggered on an outburst from SGR1806-20 at 22:38:26.86 UT 30 Jan 05.
This is a large normal burst from this source.  The peak rate is 340,000 cnts/sec
(1-sec average).  There was a single spike with a 0.4-sec rise, a 4.2-sec decay,
with additional emission extending out to ~T+15 sec.  On top of this tail,
there are five spikes at T+7, T+17, T+32, T+85, and T+118sec.
The fluence is ~1x10e-5 erg/cm2 (15-350 keV).  We note that this is
five orders of magnitude smaller than the giant flare from this source
on 27 Dec 04.  Also note that there was a burst from this source
earlier today at 20:45:26 UT with a peak rate of ~4000 cnts/sec
(0.128-sec average) and a duration of ~0.5 sec.