{
  "bibcode": "2009GCN..9085....1S",
  "body": "M. Suzuki, M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA),\nN. Kodaka, W. Iwakiri, M. Tashiro, Y. Terada, Y. Urata, A. Endo,\nK. Onda, K. Morigami, T. Sugasahara (Saitama U.), T. Enoto,\nK. Nakazawa, K. Makishima (Univ. of Tokyo), S. Sugita, K. Yamaoka\n(Aoyama Gakuin U.), Y. E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara,\nT. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.),\nE. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori, K. Kono,\nH. Hayashi (Univ. of Miyazaki), S. Hong (Nihon U.), N. Vasquez\n(Tokyo Tech.), on behalf of the Suzaku WAM team, report:\n\nThe bright long GRB090401A (Swift/BAT trigger #348128; Schady et al., \nGCN 9062; Sato et al., GCN 9064) was detected by the the Suzaku Wide-band \nAll-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV \nat 00:02:34.509 UT (=T0).\n\nThe observed light curve shows a multi-peaked structure lasting from \nT0-5s to T0+38s.  There is also a weak precursor starting at ~T0-103s, \n resulting in the total duration (T90) of about 112 seconds.\nThe fluence in 100 - 1000 keV was 1.37(-0.10,+0.08) x10^-5 erg/cm^2.\nThe 1-s peak flux measured from T0+27s was 5.1(-0.4,+0.5) photons/cm^2/s\nin the same energy range.\n\nPreliminary result shows that the time-averaged spectrum from T0-5s to\nT0+38s is fitted by a single power-law with a photon index\nof 2.14 (-0.13,+0.14) (chi^2/d.o.f = 21.4/24).\n3 % systematic errors were included in low energy channels. \nAll the quoted errors are at 90% confidence level. \n\nThe light curves with 1-sec time resolution for this burst will be appeared at:\n http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html",
  "circularId": 9085,
  "createdOn": 1238833656000,
  "email": "yamaoka@phys.aoyama.ac.jp",
  "subject": "GRB 090401A: Suzaku WAM observation of the prompt emission",
  "submitter": "Kazutaka Yamaoka at Aoyama Gakuin U  <yamaoka@phys.aoyama.ac.jp>",
  "eventId": "GRB 090401A"
}