TITLE: GCN CIRCULAR NUMBER: 14892 SUBJECT: GRB 130606B: Suzaku WAM observation of the prompt emission DATE: 13/06/13 11:04:12 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 bright, long GRB 130606B (Fermi-LAT detection: G. Vianello, et al . 14795) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at UT 11:55:35.360(=T0). The observed light curve shows a multi-peaked structure starting at T0-3.5 s, ending at T0+63 s with a duration (T90) of about 43.7 seconds. The fluence in 100 - 1000 keV was 1.33 (-0.73, +0.02) *10^-4 erg/cm^2. The 1-s peak flux measured from T0+11.5 s was 20.64 (-4.72, +0.51) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-3 s to T0+63 s is well fitted by a GRB Band model as follows. the low-energy photon index alpha: -1.24 (-0.31, +0.79), the high-energy photon index beta: -2.08 (-0.16, +0.11), and the peak energy Epeak: 619 (-251, +396) keV, (chi^2/d.o.f = 17.1/13). Due to the brightness of this burst, a 3% systematic error was added for low energy channels. All the quoted errors are at statistical 90% confidence level. The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html