TITLE: GCN CIRCULAR NUMBER: 14942 SUBJECT: GRB 130626A, Swift-BAT refined analysis DATE: 13/06/27 20:18:56 GMT FROM: Amy Lien at GSFC T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), M. De Pasquale (UCL-MSSL), 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), 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-119 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130626A (trigger #559075) (De Pasquale, et al., GCN Circ. 14931). The BAT ground-calculated position is RA, Dec = 273.128, -9.525 deg which is RA(J2000) = 18h 12m 30.6s Dec(J2000) = -09d 31' 29.9" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a double short-peaked structure at T~ 0 sec. The second peak is slightly weaker than the first peak, and starts immediately at the end of the first peak. Each peak lasts ~ 0.08 sec. T90 (15-350 keV) is 0.16 +- 0.03 sec (estimated error including systematics). The time-averaged spectrum from T-0.0 to T+0.2 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index -0.53 +- 1.39, and Epeak of 74.5 +- 25.6 keV (chi squared 54.40 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.2 +- 0.8 x 10^-08 erg/cm2 and the 1-sec peak flux measured from T-0.41 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.30 +- 0.21 (chi squared 62.40 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/559075/BA/