{
  "bibcode": "2010GCN.10353....1U",
  "body": "T. Uehara, Y.Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.)\nK. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U),\nY. Terada, M. Tashiro, A. Endo, K. Onda, T. Sugasahara, W. Iwakiri (Saitama U.),\nM. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA),\nY. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji,\nE. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi\n(Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata, H. M. Lin (NCU),\nT. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong\n(Nihon U.), on behalf of the Suzaku WAM team, report:\n\nThe long GRB 100116A (Fermi/GBM trigger #285370262 / 100116.89 \nBriggs et al., GCN 10330, McEnery et al., GCN 10333) triggered the Suzaku \nWide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV \nat 21:31:00.15 UT (=T0).\n\nThe observed light curve shows two separated pulses, a precursor at T0+0 to T0+4 sec \nand a main harder pulse at T0+81 to T0+111 sec, and the duration (T90) was about \n96 seconds. The fluences in 100 - 1000 keV were 1.24(-0.16, +0.17) e-6 and 2.89 (-0.08, +0.06) e-5 erg/cm^2 \nin the precursor and the main pulse, respectively. The 1-s peak flux measured from T0+94 s\nwas 7.26 (-0.43, +0.47) photons/cm^2/s in the same energy range.\n\nPreliminary result shows that the time-averaged spectrum from\nT0+81 s to T0+111 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      1.15 (-0.10, +0.09), and\n  Epeak      1119 (-135, +137) keV (chi^2/d.o.f. = 79.0/54).\n\nDue to the brightness of this burst, a 3% systematic error\nwas added for low energy channels.\nAll the quoted errors are at 90% confidence level.\n\nThe light curves of this event are available at the following URL:\n http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html\n\n-- \n\n Takeshi Uehara  (Hiroshima Univ.)\n E-mail: uehara@hep01.hepl.hiroshima-u.ac.jp",
  "circularId": 10353,
  "createdOn": 1264079185000,
  "email": "uehara@hirax7.hepl.hiroshima-u.ac.jp",
  "subject": "GRB 100116A: Suzaku WAM observation of the prompt emission",
  "submitter": "Takeshi Uehara at Hiroshima U  <uehara@hirax7.hepl.hiroshima-u.ac.jp>",
  "eventId": "GRB 100116A"
}