TITLE: GCN CIRCULAR NUMBER: 16553 SUBJECT: GRB 140709A, Swift-BAT refined analysis DATE: 14/07/09 16:29:31 GMT FROM: Hans Krimm at NASA-GSFC C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), 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-239 to T+626 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140709A (trigger #603810) (Hagen, et al., GCN Circ. 16546). The BAT ground-calculated position is RA, Dec = 304.666, 51.222 deg which is RA(J2000) = 20h 18m 39.9s Dec(J2000) = +51d 13' 17.8" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 61%. The mask-weighted light curve shows a complex structure. Burst activity begins at T-50 sec, with a gradual rise to a peak at T+0 sec, punctuated by several subsidiary peaks. Then there is a return to near background by T+8 sec, followed by a second main peak at T+15 sec. There are additional smaller and softer peaks centered at T+55 and T+75 sec. T90 (15-350 keV) is 98.6 +- 7.7 sec (estimated error including systematics). The time-averaged spectrum from T-46.1 to T+93.4 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.23 +- 0.27, and Epeak of 78.0 +- 20.4 keV (chi squared 57.80 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.2 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+15.48 sec in the 15-150 keV band is 3.1 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.74 +- 0.06 (chi squared 69.09 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/603810/BA/