TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4194 SUBJECT: GRB 051105: Swift-BAT improved refined analysis DATE: 05/11/05 16:22:19 GMT FROM: Louis M Barbier at NASA/GSFC/Swift L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), T. Mitani (ISAS), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS), M. Suzuki (Saitama), J. Tueller (GSFC), on behalf of the Swift/BAT team: We have re-analyzed GRB 051105 (GCN Circ 4188, Mineo et al., and GCN Circ 4190, Cummings et al.) based on new time interval T0 to T0 + 0.120 sec. The improved refined BAT ground position is (RA,Dec) = 265.277, 34.949, {17h 41m 6.6s, 34d 56' 56.8"} [deg; J2000] +- 2.5 arcmin, (90% containment). The partial coding was 81%. The photon index of the time-averaged spectrum is 1.33 +- 0.35 in the time interval TO + 0.122 sec. The fluence in the 15-150 keV band is (2.0 +- 0.46) x 10^-8 erg/cm2. The peak photon flux in the same time window measured in the 15-150 band is (2.0 +- 0.43) ph/cm2/sec. All the quoted errors are at the 90% confidence level.