TITLE: GCN CIRCULAR NUMBER: 9623 SUBJECT: GRB 090708, Swift-BAT refined analysis DATE: 09/07/08 14:26:44 GMT FROM: Hans Krimm at NASA-GSFC D. M. Palmer (LANL), 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), A. M. Parsons (GSFC), 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+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090708 (trigger #356776) (Krimm, et al., GCN Circ. 9621). The BAT ground-calculated position is RA, Dec = 154.632, 26.616 deg which is RA(J2000) = 10h 18m 31.7s Dec(J2000) = +26d 36' 58.7" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 27%. The main pulse began at T-2 sec, peaked at ~T+4 sec and decayed by ~T+16 sec. There is a hint of some low-level emission out to ~T+100 sec. At T+160 sec, a pre-planned slew took the burst out of the BAT field of view. T90 (15-350 keV) is 15.0 +- 3.9 sec (estimated error including systematics). The time-averaged spectrum from T-1.3 to T+17.7 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.22. The fluence in the 15-150 keV band is 6.9 +- 1.0 x 10-7 erg/cm2. The 1-sec peak photon flux measured from T+3.37 sec in the 15-150 keV band is 1.3 +- 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/356776/BA/