TITLE: GCN CIRCULAR NUMBER: 10371 SUBJECT: GRB 100205A: Swift-BAT refined analysis DATE: 10/02/05 18:16:34 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), J. L. Racusin (NASA/GSFC), 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 the recent telemetry downlink, we report further analysis of BAT GRB 100205 (trigger #411248) (Racusin, et al., GCN Circ. 10361). The BAT ground-calculated position is RA, Dec = 141.385, 31.740 deg which is RA(J2000) = 09h 25m 32.5s Dec(J2000) = +31d 44' 23.7" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%. The mask-weighted light curve shows a roughly symetric peak starting at ~T-15 sec, peaking at ~T+5 sec, and ending at ~T+30 sec. T90 (15-350 keV) is 26.0 +- 8 sec (estimated error including systematics). The time-averaged spectrum from T-12.6 to T+25.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.60 +- 0.25. The fluence in the 15-150 keV band is 4.0 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+8.12 sec in the 15-150 keV band is 0.4 +- 0.1 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/411248/BA/