{
  "bibcode": "2009GCN..8882....1H",
  "body": "Y. Hanabata, Y. Fukazawa, T. Takahashi, T. Uehara, C. Kira (Hiroshima U.),\nY. Terada, M. Tashiro, Y. Urata, A. Endo, K. Onda, N. Kodaka,\nK. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), M. Ohno,\nM. Kokubun, M. Suzuki, T. Takahashi (ISAS/JAXA), K. Yamaoka,\nS. Sugita (Aoyama Gakuin U.), T. Enoto, K. Nakazawa, K. Makishima\n(Univ. of Tokyo), Y.E. Nakagawa, T. Tamagawa (RIKEN),\nE. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori, K. Kono,\nH. Hayashi (Univ. of Miyazaki), S. Hong (Nihon U.),\nN. Vasquez (Tokyo Tech), on behalf of the Suzaku WAM team, report:\n\nThe long GRB 090131 (Goldstein et al., GCN 8876) triggered the\nSuzaku Wide-band All-sky Monitor (WAM) which covers an energy\nrange of 50 keV - 5 MeV at 2009-01-31 02:09:24.187 UT (=T0).\n\nThe observed light curve shows a multi-peaked structure starting at T0-5s,\nending at T0+46s with a duration (T90) of about 32.6 seconds. The fluence in\n100 - 1000 keV was 9.95(-0.59, +0.57) x 10^-6 erg/cm^2. The 1-s peak\nflux measured from T0+19s was 5.01(-0.39, +0.35) photons/cm^2/s in the\nsame energy range.\n\nPreliminary result shows that the time-averaged spectrum from T0-5s\nto T0+46s is fitted by a single power-law with a photon index\nof 2.29(-0.15, +0.17) (chi^2/d.o.f = 11.4/13).\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 are available at:\nhttp://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html",
  "circularId": 8882,
  "createdOn": 1233795913000,
  "email": "hanabata@hep01.hepl.hiroshima-u.ac.jp",
  "subject": "GRB 090131: Suzaku WAM observation of the prompt emission",
  "submitter": "Yoshitaka Hanabata at Hiroshima U  <hanabata@hep01.hepl.hiroshima-u.ac.jp>",
  "eventId": "GRB 090131"
}