TITLE: GCN CIRCULAR NUMBER: 15014 SUBJECT: GRB 130715A: Suzaku WAM observation of the prompt emission DATE: 13/07/22 08:37:22 GMT FROM: Makoto Tashiro at Saitama U/Swift Y. Ishida, M. Tashiro, Y. Terada, T. Yasuda, H. Ueno, S. Sugimoto (Saitama U.), M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.), M. Yamauchi, N. Ohmori, M. Akiyama (Univ. of Miyazaki), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), W. Iwakiri(RIKEN), Y. Hanabata (ICRR), Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report: The long GRB 130715A (Andrew et al GCN15005) was detected by the the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 21:44:38.377 UT (=T0). The observed light curve shows double-peaked structure starting at T0-30s, ending at T0+62s with a duration (T90) of about 46 seconds. The fluence in 100 - 1000 keV was 3.38(+0.31/-0.27)x10^-5 erg/cm^2. The 1-s peak flux measured from T0s was 2.66(+0.49/-1.36) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-30s to T0+62s is well fitted by a power-law with exponential cutoff model : dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with alpha 1.66(+0.31/-0.65), and Epeak 527(+429/-274) keV (chi^2/d.o.f. = 10.2/13). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are included. The light curves for this burst will be available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html