{
  "bibcode": "2013GCN.14599....1Y",
  "body": "T. Yasuda, M. Tashiro, Y. Terada, Y. Ishida, H. Ueno, S. Sugimoto\n(Saitama U.), M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui,\nY. Fukazawa (Hiroshima U.), M. Yamauchi, N. Ohmori, M. Akiyama\n(Univ. of Miyazaki), K. Yamaoka (Nagoya U.),  S. Sugita (Ehime U.),\nY. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), W. Iwakiri\n(RIKEN), Y. Hanabata (ICRR), Y. Urata (NCU), K. Nakazawa,\nK. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report:\n\n\nThe bright, long GRB 13505A (GCN 14563; Cannizzo et al.)\ntriggered the Suzaku Wide-band  All-sky Monitor (WAM) which covers an\nenergy range of 50 keV - 5 MeV at  UT 08:22:24.527 (=T0).\n\nThe observed light curve shows a bright peak followed by a weaker\nemission seen up to T0+30 s with a duration (T90) of about 14 seconds.\nThe fluence in 100 - 1000 keV was 1.06 (+0.05/-0.05) x10^-4 erg/cm^2.\nThe 1-s peak flux measured from T0+4 s was\n53.1 (+2.0/-2.5) photons/cm^2/s in the same energy range.\n\nPreliminary result shows that the time-averaged spectrum from\nT0-2 s to T0+30 s is well fitted by a GRB Band model as follows.\nthe low-energy photon index alpha: -0.99 (+0.17/-0.11),\nthe high-energy photon index beta: -2.33 (+0.06/-0.07),\nand the peak energy Epeak: 1094 (+131/-175) keV (chi^2/d.o.f = 23.9/23).\nUsing a redshift of z = 2.27 (Tanvir et al., GCN 14567), we estimate\nthe isotropic energy release in the 1 keV - 10 MeV range to be\n2.55 (+0.12/- 0.11) x10^54 erg and the peak energy at the rest frame\nto be 3615 (+532/-469) keV, where cosmological parameters of the Omega\nmatter, the Omega lambda and the Hubble constant are fixed at 0.27, 0.73\nand 70 km/s/Mpc respectively.\n\nDue to the brightness of this burst, a 3% systematic error was added for\nlow energy channels.\nAll the quoted errors are at statistical 90% confidence level.\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": 14599,
  "createdOn": 1367987449000,
  "email": "tashiro@phy.saitama-u.ac.jp",
  "subject": "GRB 130505A: Suzaku WAM observation of the prompt emission",
  "submitter": "Makoto Tashiro at Saitama U/Swift  <tashiro@phy.saitama-u.ac.jp>",
  "eventId": "GRB 130505A"
}