TITLE: GCN CIRCULAR NUMBER: 8886 SUBJECT: GRB 090205: Swift-BAT refined analysis DATE: 09/02/06 03:30:35 GMT FROM: Scott Barthelmy at NASA/GSFC GRB 090205: Swift-BAT refined analysis J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), M. Perri (ASDC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+455 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090205 (trigger #342121) (Perri, et al., GCN Circ. 8884). The BAT ground-calculated position is RA, Dec = 220.917, -27.848 deg which is RA(J2000) = 14h 43m 40.0s Dec(J2000) = -27d 50' 51.4" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a single peak starting at ~T-5 sec, peaking at ~T+3 sec, and returning to background at ~T+100 sec. T90 (15-350 keV) is 8.8 +- 1.8 sec (estimated error including systematics). The time-averaged spectrum from T-2.9 to T+6.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.15 +- 0.23. The fluence in the 15-150 keV band is 1.9 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+4.09 sec in the 15-150 keV band is 0.5 +- 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/342121/BA/