{
  "bibcode": "2009GCN..9129....1I",
  "body": "W. Iwakiri, M. Tashiro, Y. Terada, A. Endo, K. Onda,\nT. Sugasahara (Saitama U.), Y. Urata (NCU),\nM. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA),\nT. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo),\nK. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa\n(RIKEN),\nT. Uehara, T. Takahashi, Y. Fukazawa, Y. Hanabata (Hiroshima U.),\nE. Sonoda, M. Yamauchi, N. Ohmori, K. Kono, H. Hayashi (Univ. of\nMiyazaki),\nS. Hong (Nihon U.), N. Vasquez (Tokyo Tech.),\non behalf of the Suzaku WAM team, report:\n\n\nThe long GRB 090410 (Swift/BATtrigger #348929 ; Grupe et al.,\nGCN 9122) triggered the Suzaku Wide-band  All-sky Monitor (WAM)\n which covers an energy range of 50 keV - 5 MeV at 16:57:53.392 UT\n(=T0).\n\nThe observed light curve shows  main peaks starting at T0-5s, ending\nat T0+25s, followed by a long weak tail seen up to T0+150s. And the\nprecursor activity reported by Swift/BAT (Barthelmy et al., GCN 9123)\nis also seen at T0-55s. The total T90 duration including this precursor\nis about 166 seconds. The fluence in 100 - 1000 keV was 1.2 +/- 0.3  x\n10^-5 erg/cm^2. The 1-s scaled peak flux measured from T0+5s was 3.0\n(-0.3, +0.2)\nphotons/cm^2/s in the same energy range.\n\nPreliminary result shows that the time-averaged spectrum from T0-60s to\nT0+150s is well fitted by a single power-law with a photon index\nof 2.3 (-0.3, +0.3) (chi^2/d.o.f = 4.9/8), and the spectrum of the main\nbright peak from T0-5s to T0+25s is well fitted by a power-law with\nexponential cutoff model:\n dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak) with\n alpha       1.3 +/-0.5, and\n Epeak       304 (-79, +60) keV (chi^2/d.o.f. = 7.9/7).\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:\n\n http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html",
  "circularId": 9129,
  "createdOn": 1239888072000,
  "email": "ohno@astro.isas.jaxa.jp",
  "subject": "GRB 090410: Suzaku WAM observation of the prompt emission",
  "submitter": "Masanori Ohno at ISAS/JAXA  <ohno@astro.isas.jaxa.jp>",
  "eventId": "GRB 090410"
}