TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2959
SUBJECT: GRB050117b: Swift-BAT detection of a weak burst
DATE:    05/01/18 00:29:22 GMT
FROM:    David Palmer at LANL  <palmer@nis.lanl.gov>

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

At 20:03:35 UT, the Swift Burst Alert Telescope (BAT) triggered and
located on-board GRB050117b.

The BAT on-board calculated location is RA,Dec 243.380,-70.358 (J2000)
with an uncertainty of 10 arcmin (radius, 3-sigma, including a large systematic
uncertainty).  This is 44 deg off the BAT boresight.  This burst occurred
with a steeply decreasing background event rate while Swift was exiting the SAA.
This weak burst is at the BAT detection threshold.  The duration is ~2 sec.