{
  "bibcode": "2009GCN..9900....1O",
  "body": "N. Ohmori, K. Noda, E. Sonoda, K. Kono, H. Hayashi, A. Daikyuji, \nY. Nishioka, M. Yamauchi (Univ. of Miyazaki),\nM. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA),\nK. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y. E. Nakagawa,\nT. Tamagawa (RIKEN), S. Hong (Nihon U.), N. Vasquez (Tokyo Tech.),\nY. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.),\nW. Iwakiri, M. Tashiro, Y. Terada, A. Endo, K. Onda,\nT. Sugasahara (Saitama U.), Y. Urata (NCU),\nT. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo),\non behalf of the Suzaku WAM team, report:\n\nThe long GRB 090831A (Fermi-GBM trigger 273396998 / 090831317;\nArne et al., GCN 9850, MAXI-GSC; Matsuoka et al., GCN 9852) \ntriggered the Suzaku Wide-band All-sky \nMonitor (WAM) which covers an energy range of 50 keV - 5 MeV\nat 07:36:36.472 UT (=T0).\n\nThe observed light curve shows main three peaks starting at T0s, \nending at T0+10s, followed by a long weak tail seen up to T0+48s.\nThe total T90 duration is about 53 seconds.\n\nThe fluence in 100 - 1000 keV was 6.8 (-1.8, +1.0)x10-6 erg/cm2.\nThe 1-s peak flux measured from T0+4 s was 1.8 (-0.2, +0.3) photons/cm2/s \nin the same energy range.\n\nPreliminary result shows that the time-averaged spectrum from\nT0 s to T0+48 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        0.89(-0.91, +0.65), and\n  Epeak        286(-57, +88) keV (chi2/d.o.f. = 93/80).\n \nAll the quoted errors are at statistical 90% confidence level,\nin which the systematic uncertainties are not included.\n \nThe light curves for this burst is available at:\nhttp://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html",
  "circularId": 9900,
  "createdOn": 1252137598000,
  "email": "ohmori@astro.miyazaki-u.ac.jp",
  "subject": "GRB 090831A: Suzaku WAM observation of the prompt emission",
  "submitter": "Norisuke Ohmori at Miyazaki U  <ohmori@astro.miyazaki-u.ac.jp>",
  "eventId": "GRB 090831A"
}