TITLE: GCN CIRCULAR NUMBER: 14834 SUBJECT: GRB 130609A, Swift-BAT refined analysis DATE: 13/06/09 13:43:19 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift 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), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130609A (trigger #557782) (Cummings, et al., GCN Circ. 14828). The BAT ground-calculated position is RA, Dec = 152.680, 24.124 deg which is RA(J2000) = 10h 10m 43.2s Dec(J2000) = +24d 07' 27.1" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 87%. The mask-weighted light curve shows a single FRED peak. T90 (15-350 keV) is 7.0 +- 0.8 sec (estimated error including systematics). The time-averaged spectrum from T-1.19 to T+7.28 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.88 +- 0.11. The fluence in the 15-150 keV band is 5.7 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.52 sec in the 15-150 keV band is 1.8 +- 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/557782/BA/