TITLE: GCN CIRCULAR NUMBER: 10828 SUBJECT: GRB 100606A: Swift-BAT refined analysis DATE: 10/06/07 04:23:39 GMT FROM: Scott Barthelmy at NASA/GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), C. B. Markwardt (GSFC/UMD), S. R. Oates (UCL-MSSL), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100606A (trigger #424031) (Oates, et al., GCN Circ. 10824). The BAT ground-calculated position is RA, Dec = 350.617, -66.234 deg, which is RA(J2000) = 23h 22m 28.1s Dec(J2000) = -66d 14' 03.3" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 25%. The mask-weighted light curve shows an initial FRED peak starting at ~T-0.2 sec, peaking at ~T+0.5 sec. Then there are two peaks at ~T+12 and ~T+20 sec followed by a roughly exponential decay out to ~T+180 sec. Another, weak peak occurs at ~T+200 followed by some very weak emission out to ~T+370 sec, and possibly out to ~T+500 sec. T90 (15-350 keV) is 480 +- 150 sec (estimated error including systematics). The time-averaged spectrum from T+0.3 to T+672.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.35 +- 0.10. The fluence in the 15-150 keV band is 6.4 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+7.82 sec in the 15-150 keV band is 1.6 +- 0.4 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/424031/BA/