Suzaku Wide-band All-sky Monitor – 10 Years history

Development of the HXD-II wide-band all-sky monitor onboard Astro-E2

IEEE Transactions on Nuclear Science ◽

10.1109/tns.2005.862778 ◽

2005 ◽

Vol 52 (6) ◽

pp. 2765-2772 ◽

Cited By ~ 74

Author(s):

K. Yamaoka ◽

M. Ohno ◽

Y. Terada ◽

S. Hong ◽

J. Kotoku ◽

...

Keyword(s):

Wide Band ◽

Sky Monitor

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Design and In-Orbit Performance of the Suzaku Wide-Band All-Sky Monitor

Publications of the Astronomical Society of Japan ◽

10.1093/pasj/61.sp1.s35 ◽

2009 ◽

Vol 61 (sp1) ◽

pp. S35-S53 ◽

Cited By ~ 36

Author(s):

Kazutaka Yamaoka ◽

Akira Endo ◽

Teruaki Enoto ◽

Yasushi Fukazawa ◽

Ryuji Hara ◽

...

Keyword(s):

Wide Band ◽

Sky Monitor

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Sub-MeV band observation of a hard burst from AXP 1E 1547.0−5408 with the Suzaku Wide-band All-sky Monitor

Publications of the Astronomical Society of Japan ◽

10.1093/pasj/psv011 ◽

2015 ◽

Vol 67 (3) ◽

pp. 41 ◽

Cited By ~ 4

Author(s):

Tetsuya Yasuda ◽

Wataru B. Iwakiri ◽

Makoto S. Tashiro ◽

Yukikatsu Terada ◽

Tomomi Kouzu ◽

...

Keyword(s):

Wide Band ◽

Sky Monitor

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Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor

Publications of the Astronomical Society of Japan ◽

10.1093/pasj/psz054 ◽

2019 ◽

Vol 71 (4) ◽

Author(s):

Norisuke Ohmori ◽

Kazutaka Yamaoka ◽

Makoto Yamauchi ◽

Yuji Urata ◽

Masanori Ohno ◽

...

Keyword(s):

Short Duration ◽

Power Law ◽

Spectral Properties ◽

Gamma Ray ◽

Wide Band ◽

High Energy ◽

Gamma Ray Bursts ◽

Sky Monitor ◽

S Peak ◽

Single Power

Abstract We have systematically studied the spectral properties of 302 localized gamma-ray bursts (GRBs) observed by the Suzaku wide-band all-sky monitor (WAM) from 2005 August to 2010 December. The energy spectra in the 100–5000 keV range integrated over the entire emission and the 1 s peak were fitted by three models: a single power law, a power law with an exponential cutoff (CPL), and the GRB Band function (GRB). Most of the burst spectra were well fitted by a single power law. The average photon index α was −2.11 and −1.73 for long and short bursts, respectively. For the CPL and GRB models, the low-energy and high-energy photon indices (α and β) for the entire emission spectra were consistent with previous measurements. The averages of the α and β were −0.90 and −2.65 for long-duration GRBs, while the average α was −0.55 and the β was not well constrained for short-duration GRBs. However, the average peak energy Epeak was 645 and 1286 keV for long- and short-duration GRBs respectively, which are higher than previous Fermi/GBM measurements (285 keV and 736 keV). The α and Epeak of the 1 s peak spectra were larger, i.e., the spectra were harder, than the total fluence spectra. Spectral simulations based on Fermi-GBM results suggest that the higher Epeaks measured by the Suzaku WAM could be due to detector selection bias, mainly caused by the limited energy range above 100 keV.

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Timing Analysis of Unusual GRB 090709A Observed by Suzaku Wide-band All sky Monitor

10.1063/1.3509358 ◽

2010 ◽

Author(s):

W. Iwakiri ◽

M. Ohno ◽

T. Kamae ◽

Y. E. Nakagawa ◽

Y. Terada ◽

...

Keyword(s):

Timing Analysis ◽

Wide Band ◽

Sky Monitor

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Suzaku Wide-band All-sky Monitor (WAM) observations of GRBs and SGRs

Publications of the Astronomical Society of Japan ◽

10.1093/pasj/psx026 ◽

2017 ◽

Vol 69 (3) ◽

Cited By ~ 1

Author(s):

Kazutaka Yamaoka ◽

Masanori Ohno ◽

Makoto S. Tashiro ◽

Kevin Hurley ◽

Hans A. Krimm ◽

...

Keyword(s):

Wide Band ◽

Sky Monitor

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Spectral Evolutions Study of Gamma-Ray Burst Exponential Decays with Suzaku-WAM

Proceedings of the International Astronomical Union ◽

10.1017/s1743921312013592 ◽

2011 ◽

Vol 7 (S279) ◽

pp. 411-412

Author(s):

Makoto S. Tashiro ◽

Kaori Onda ◽

Kazutaka Yamaoka ◽

Masahiro Ohno ◽

Satoshi Sugita ◽

...

Keyword(s):

Exponential Decay ◽

Gamma Ray ◽

Thermal Emission ◽

Wide Band ◽

Light Curves ◽

Emission Model ◽

Spectral Evolution ◽

Time Resolved ◽

Gamma Ray Burst ◽

Sky Monitor

AbstractAn observational study is presented of the spectral evolution of gamma-ray burst (GRB) prompt emissions with the Suzaku Wide-band All-sky Monitor (WAM). We selected 6 bright GRBs exhibiting 7 well-separated fast-rise-exponential-decay (FRED) shaped light curves to investigate spectral changes by evaluating exponential decay time constants of the energy-resolved light curves. In addition, we carried out time-resolved spectroscopy of two of them which were located with accuracy sufficient to evaluate the time-resolved spectra with precise energy response matrices. The two imply different emission mechanisms; the one is well reproduced with a cooling blackbody radiation model with a power-law component, while the other prefers non-thermal emission model with a decaying turn over energy.

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