TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3156
SUBJECT: Swift-BAT detection of GRB 050331
DATE:    05/03/31 18:40:05 GMT
FROM:    David Palmer at LANL  <palmer@nis.lanl.gov>

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

At 17:11:53 UT Swift-BAT triggered on a burst GRB 050331, and 
automatically slewed.  A few of the standard GCN/Swift Notices were 
delayed, because
this burst occurred during a regular Malindi telemetry downlink session.
The BAT-derived position is RA,Dec=140.771,-41.430 (J2000).  We note this
is 91 arcsec from the XRT Position GCN Notice.  The lightcurve
has some low-significance peaks for the first ~15 sec, then two peaks
at T+15 and T+18 sec (of 1 and 2 sec duration, resp.) with a total
burst duration of ~20 sec.  The peak count rate is ~1000 cnts/sec.
--