TITLE: GCN CIRCULAR NUMBER: 8808 SUBJECT: GRB 090113: Swift-BAT refined analysis DATE: 09/01/14 00:07:29 GMT FROM: Scott Barthelmy at NASA/GSFC GRB 090113: Swift-BAT refined analysis J. Tueller (GSFC), 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), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-120 to T+302 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090113 (trigger #339852) (Krimm, et al., GCN Circ. 8804). The BAT ground-calculated position is RA, Dec = 32.067, 33.436 deg, which is RA(J2000) = 02h 08m 16.0s Dec(J2000) = +33d 26' 08.4" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%. The mask-weighted light curve shows multiple peaks starting at ~T-10 sec and ending at ~T+30 sec. T90 (15-350 keV) is 9.1 +- 0.9 sec (estimated error including systematics). The time-averaged spectrum from T-0.9 to T+10.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.60 +- 0.10. The fluence in the 15-150 keV band is 7.6 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+1.46 sec in the 15-150 keV band is 2.5 +- 0.2 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/339852/BA/