GCN Circular 4269

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

At 15:22:35 UT Swift-BAT detected GRB 051113 (trigger=163765)
(GCN Circ 4268, Holland et al.).  The refined BAT ground position
is (RA,Dec) = 187.267, -26.387, [deg; J2000] {12h 29m 4.2s, -26d 23' 14"}
 +- 2 arcmin, (95% containment).  The partial coding was 25%.  

The light curve shows multiple peaks at T-30 seconds, T, T+50 seconds,
and T+70 seconds.  T90 (15-350 keV) is (94 +- 1) seconds 
(estimated error including systematics).  

The photon index of the time-averaged spectrum is 1.70 +- 0.14.  
The fluence in the 15-150 keV band is (2.6 +- 0.2) x 10^-6 erg/cm2.  
The 1-s peak photon flux measured from T+ 1 second in the 15-350 
band is (2.4 +- 0.3) ph/cm2/sec.  All the quoted errors are at the 90% 
confidence level.