TITLE: GCN CIRCULAR NUMBER: 15885 SUBJECT: GRB 140219A: Suzaku WAM observation of the prompt emission DATE: 14/02/27 11:42:27 GMT FROM: Tetsuya Yasuda at Saitama U W. Iwakiri(RIKEN), M. Tashiro, Y. Terada, T. Yasuda, Y. Ishida, H. Ueno, S. Sugimoto, S. Koyama, S. Takeda, T. Nagayoshi (Saitama U.), M. Yamauchi, N. Ohmori, M. Akiyama, R. Kinoshita (Univ. of Miyazaki), M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. Hanabata (ICRR), Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report: The extremely bright and long-duration GRB 140219A (localized by IPN: Hurley et al., GCN 15864; Fermi-GBM detection: Zhang, GCN 15866; Fermi-LAT detection: Guiriec et al., GCN 15867; Konus-Wind detection: Golenetskii et al., GCN15870; MAXI/GSC detection: Serino et al., GCN15882) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 19:45:57.754 UT (=T0). The observed light curve shows a strong multi-peaked structure lasting from T0 s to T0+3 s, followed by a weaker multi-peaked emissions seen up to T0+27 s with a total duration (T90) of about 17 seconds.  The fluence in 100 - 1000 keV was 1.73 (+0.06,-0.08)x10^-5 erg/cm^2. The 1-s peak flux measured from T0+1.5 s was 83.6 (+6.5,-6.4) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0 s to T0+27 s is fitted by a GRB Band model as follows. the low-energy photon index alpha: -1.00 (+0.06,-0.11), the high-energy photon index beta: -2.68 (+0.08,-0.11), and the peak energy Epeak: 1930(+176,-79) keV (chi^2/d.o.f = 71.9/47). There might be some calibration uncertainties in spectral parameters since the GRB photons came through the X-ray micro-calorimeter (XRS) dewar. All the quoted errors are at 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