TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4190
SUBJECT: GRB 051105: Swift-BAT refined analysis
DATE:    05/11/05 12:03:06 GMT
FROM:    Hans Krimm at NASA-GSFC  <krimm@milkyway.gsfc.nasa.gov>

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

Using the data set from T-60 to T+120 sec from the recent telemetry
downlink, we confirm the short duration of GRB 051105
(trigger #162580)  (Mineo, et al., GCN 4188). The BAT ground position
is (RA,Dec) =  265.288,+34.904 {17h 41m 09s,+34d 55' 15"} [deg; J2000]
+-1.3 arcmin, (radius, sys+stat, 90% containment).  The partial coding was 89%.

The light curve shows a single peak with a fast rise and a slower decay.
T90 (15-350 keV) is (0.028 +- 0.004) sec. (estimated error including
systematics). All of the emission appears to be below 100 keV.

Spectral analysis including flux values will follow in a later circular.