TITLE: GCN CIRCULAR NUMBER: 16560 SUBJECT: GRB 140709B: Swift-BAT refined analysis DATE: 14/07/10 02:19:39 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), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), C. A. Swenson (PSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (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 140709B (trigger #603866) (Swenson, et al., GCN Circ. 16551). The BAT ground-calculated position is RA, Dec = 146.040, 63.536 deg which is RA(J2000) = 09h 44m 09.5s Dec(J2000) = +63d 32' 10.0" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%. The mask-weighted light curve shows a complex structure. The first peak has a broad, symmetrical shape, starting at T-20 sec, peaking at T+25 sec and ending at T+60 sec. Then the second episode begins at T+80 sec, with multiple short (~1-2 second) peaks extending to T+140 sec, before cutting off. The highest of these short peaks is at T+125 sec. T90 (15-350 keV) is 155.0 +- 22.3 sec (estimated error including systematics). The time-averaged spectrum from T-13.94 to T+197.51 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.79 +- 0.30, and Epeak of 152.6 +- 111.0 keV (chi squared 48.15 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.2 +- 0.2 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+123.63 sec in the 15-150 keV band is 0.9 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.22 +- 0.07 (chi squared 54.91 for 57 d.o.f.). 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/603866/BA/