TITLE: GCN CIRCULAR NUMBER: 14833 SUBJECT: GRB 130608A: Swift-BAT refined analysis DATE: 13/06/09 12:34:01 GMT FROM: Scott Barthelmy at NASA/GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), 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 130608A (trigger #557771) (Krimm, et al., GCN Circ. 14827). The BAT ground-calculated position is RA, Dec = 24.594, 41.485 deg, which is RA(J2000) = 01h 38m 22.5s Dec(J2000) = +41d 29' 05.0" with an uncertainty of 2.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 45%. The mask-weighted light curve shows a broad peak starting at ~T-25 sec, peaking at ~T+5 sec, and ending at ~T+50 sec. T90 (15-350 keV) is 44.4 +- 8.0 sec (estimated error including systematics). The time-averaged spectrum from T-25.56 to T+24.18 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 3.21 +- 0.34. The fluence in the 15-150 keV band is 6.4 +- 1.0 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+19.06 sec in the 15-150 keV band is 0.6 +- 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/557771/BA/