[vsnet-grb-info 12506] GRB 121011A Suzaku WAM observation of the prompt emission

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13873
SUBJECT: GRB 121011A Suzaku WAM observation of the prompt emission
DATE:    12/10/16 08:58:49 GMT
FROM:    Masanori Ohno at Hiroshima U  <ohno at hep01.hepl.hiroshima-u.ac.jp>

K. Takaki, Y. Hanabata, T. Kawano, R. Nakamura, Y. Tanaka, M. Ohno,
Y. Fukazawa (Hiroshima U.), S. Sugita (Nagoya U.),
H. Ueno, M. Tashiro, Y. Terada, W. Iwakiri, T. Yasuda, M. Asahina,
S. Kobayashi, A. Sakamoto, Y. Ishida, S. Sugimoto (Saitama U.),
M. Akiyama, N. Ohmori, E. Mochinaga, M. Yamauchi (Univ. of Miyazaki)
Y. E. Nakagawa (Waseda U.), K. Yamaoka, M. Kokubun, T. Takahashi
(ISAS/JAXA),
Y. Urata, P. Tsai (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo),
on behalf of the Suzaku WAM team, report:

The long GRB 121011A (Swift/BAT trigger #535764; Racusin et al., GCN 13845;
Fermi-LAT detection: Ohno et al., GCN 13777) was detected by
the Suzaku Wide-band  All-sky Monitor (WAM) which covers an energy range
of 50 keV - 5 MeV at 11:15:30.264 UT (=T0).


The observed light curve shows a single peak structure starting
at T0-10 s, ending at T0+30 s with the total duration (T90) is about 31
seconds. The fluence of main pulse in 100 - 1000 keV was
  4.70 (-0.15, +0.10) x 10^-6 erg/cm^2
The 1-s peak flux measured at T0-1.0 s was
0.41 (-0.31, +0.29) photons/cm^2/s in the same energy range.

Preliminary result shows that the time-averaged spectrum from T0-10 s
to T0+30 s is well fitted by by a single power-law with a photon index
of 1.61 (-0.14, +0.18) (chi^2/d.o.f = 20.4/25).


The light curves for this burst are available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html