{
  "bibcode": "2011GCN.12244....1H",
  "body": "Y. Hanabata, T. Uehara, T. Takahashi, M. Mizuno, M. Ohno, Y. Fukazawa\n(Hiroshima U.), T. Yasuda, Y. Terada, M. Tashiro, W. Iwakiri,\nK. Takahara (Saitama U.), S. Sugita (Nagoya U.), K. Yamaoka (Aoyama\nGakuin U.), M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa (Waseda U.),\nN. Ohmori, M. Akiyama, M. Yamauchi (Univ. of Miyazaki), Y. Urata,\nP. Tsai, C-J. Chuang (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo),\non behalf of the Suzaku WAM team, report:\n\nThe bright long GRB110731A (Swift/BAT trigger #458448: Oates et al.\nGCN 12215, also detected by Fermi-LAT: Bregeon et al. GCN 12218)\ntriggered the Suzaku Wide-band All-sky Monitor (WAM) which covers\nan energy range of 50 keV - 5 MeV at 11:09:30.211 UT (=T0).\n\nThe observed light curve shows multiple peaks starting at T0-1.5 s, ending\nat T0+7.5 s, with a duration (T90) of about 6.56 seconds. The fluence in\n100 - 1000 keV was 1.31 (-0.12, +0.08) x 10^-5 erg/cm^2. The 1-s peak\nflux measured from T0+3.5 s was 5.20 (-0.70, +0.57) photons/cm^2/s in the\nsame range.\n\nPreliminary result shows that the time-averaged spectrum from T0-1.5 s to\nT0+7.5 s is well fitted by a power-law with exponential cutoff model:\n dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with\n alpha       0.93 (-0.66, +0.57), and\n Epeak       339 (-51, +40) keV (chi^2/d.o.f. = 11.2/12).\n\nThe light curves for this burst will be available at:\nhttp://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html",
  "circularId": 12244,
  "createdOn": 1312423955000,
  "email": "hanabata@hep01.hepl.hiroshima-u.ac.jp",
  "subject": "GRB 110731A : Suzaku WAM observation of the prompt emission",
  "submitter": "Yoshitaka Hanabata at Hiroshima U  <hanabata@hep01.hepl.hiroshima-u.ac.jp>",
  "eventId": "GRB 110731A"
}