[vsnet-grb-info 4245] GRB 070124: Suzaku WAM observation of the prompt emissions

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6043
SUBJECT: GRB 070124: Suzaku WAM observation of the prompt emissions
DATE:    07/01/27 13:38:03 GMT
FROM:    Kazutaka Yamaoka at Aoyama Gakuin U  <yamaoka at phys.aoyama.ac.jp>

K. Yamaoka, S. Sugita (Aoyama Gakuin U.), M. Ohno, T. Takahashi, 
T. Asano, T. Uehara, Y. Fukazawa (Hiroshima U.), Y. Urata, M. Tashiro, 
K. Abe, K. Onda, Y. Sato, M. Suzuki (Saitama U.), T. Enoto, R. Miyawaki, 
K. Makishima (Univ. of Tokyo), M. Suzuki, T. Tamagawa, Y. Terada (RIKEN), 
K. Nakazawa, M. Kokubun, T. Takahashi (ISAS/JAXA), S. Hong (Nihon U.), 
E. Sonoda, M. Yamauchi (Miyazaki U.), 
on behalf of the Suzaku WAM team report:

The IPN-localized short GRB 070124 (Hurley et al., GCN 6022) triggered 
the Suzaku Wide-band All-sky Monitor (WAM), which covers the energy range 
of 50 keV - 5 MeV, at 08:41:51.035 UT(=T0). 
The light curve shows two separate pulses with a total duration of 
about 0.8 seconds. The fluence in 100 - 2000 keV was 
3.1(-1.3, +0.4) x 10^-6 erg/cm2, while the 1-s peak flux measured from 
T0 was 3.4(-0.8, +0.3) photons/cm2/s in the same energy range.

The time-averaged spectrum from T0 sec to T0+2 sec is well fitted
by a cutoff power law model. 

  dN/dE ~  E^{-alpha} * exp(-(2-alpha)*E/Epeak)
  alpha       -0.19 (-0.81 +0.64), and
  Epeak         686 (-117, +197) keV.

All the quoted errors are at statistical 90% confidence level, while
systematic errors are not included. 

The WAM light curve of this event is available at
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/grb_table.html.