TITLE: GCN CIRCULAR NUMBER: 11533 SUBJECT: GRB 110106B: Swift-BAT refined analysis DATE: 11/01/07 01:56:03 GMT FROM: Scott Barthelmy at NASA/GSFC T. N. Ukwatta (GWU) S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), B. Sbarufatti (INAF-OAB/IASFPA), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team): Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 110106B (trigger #441676) (Sbarufatti, et al., GCN Circ. 11525). The BAT ground-calculated position is RA, Dec = 134.155, 47.005 deg, which is RA(J2000) = 08h 56m 37.3s Dec(J2000) = +47d 00' 17.5" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%. The mask-weighted light curve shows 3 main overlapping peaks starting at ~T-6 sec and ending at ~T+23 sec. T90 (15-350 keV) is 24.8 +- 4.8 sec (estimated error including systematics). The time-averaged spectrum from T-10.8 to T+23.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.76 +- 0.11. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.87 sec in the 15-150 keV band is 2.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/441676/BA/