TITLE: GCN CIRCULAR NUMBER: 7141 SUBJECT: GRB 071125: Suzaku WAM observation of the prompt emission DATE: 07/12/05 01:19:16 GMT FROM: Masanori Ohno at Hiroshima U M. Ohno, T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), K. Yamaoka, Y. E. Nakagawa, S. Sugita (Aoyama Gakuin U.), T. Tamagawa (RIKEN), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, M. Suzuki, N. Kodaka, K. Morigami (Saitama U.), T. Enoto, R. Miyawaki, K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi, S. Maeno, H. Tanaka, R. Hara (Univ. of Miyazaki), M. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report: The bright, IPN localized GRB 071125 (Golenetskii et al., GCN 7136) was detected by the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2007-11-25 13:56:42 UT (=T0). The observed light curve shows a double-peaked structure in 1-sec time resolution. The T90 duration was about 6.0 seconds. The fluence in 100 - 1000 keV was 5.8 (+0.4, -0.3) X 10^-5 erg/cm^2. The 1-s peak flux measured from T0+1s was 32.9 (+1.0, -1.3) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-1s to T0+12s is well fitted by a GRB Band model as follows. the low-energy photon index alpha: -1.0 (+0.4, -0.3), the high-energy photon index beta: -3.1 (+0.3, -0.6), the break energy E0: 326 (+100, -92) keV, and the peak energy Epeak: 330 (+20, -20) keV (chi^2/d.o.f = 21/22). All the quoted errors are at statistical 90% confidence level. A 3% systematic error was added to each energy channel due to the brightness of this GRB. The light curves with 1-sec time resolution for this burst will be appeared at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html --