scholarly journals Suzaku Wide-band All-sky Monitor measurements of duration distributions of gamma-ray bursts

2016 ◽  
Vol 68 (SP1) ◽  
pp. S30 ◽  
Author(s):  
Norisuke Ohmori ◽  
Kazutaka Yamaoka ◽  
Masanori Ohno ◽  
Satoshi Sugita ◽  
Ryuuji Kinoshita ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Wide Band ◽  
Gamma Ray Bursts ◽  
Sky Monitor

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

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.

X‐Ray Light Curves of Gamma‐Ray Bursts Detected with the All‐Sky Monitor on RXTE

2002 ◽  
Vol 141 (2) ◽  
pp. 415-428 ◽  
Author(s):  
D. A. Smith ◽  
A. Levine ◽  
H. Bradt ◽  
K. Hurley ◽  
M. Feroci ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Light Curves ◽  
X Ray ◽  
Sky Monitor

Gamma-ray bursts in the All-Sky Monitor on RXTE

1998 ◽  
Author(s):  
D. A. Smith ◽  
L. Wen ◽  
A. M. Levine ◽  
R. Remillard ◽  
H. Bradt ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Sky Monitor

scholarly journals Abstracts

2011 ◽  
Vol 7 (S279) ◽  
pp. 433-446
Keyword(s):  
Gamma Ray ◽  
Cosmological Parameters ◽  
Supernova Explosion ◽  
Wide Band ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Core Collapse ◽  
Host Galaxies ◽  
Unique Type ◽  
X Ray

Measuring cosmological parameters with GRBs: status and perspectivesNew interpretation of the Amati relationThe SED Machine - a dedicated transient spectrographPTF10iue - evidence for an internal engine in a unique Type Ic SNDirect evidence for the collapsar model of long gamma-ray burstsOn pair instability supernovae and gamma-ray burstsPan-STARRS1 observations of ultraluminous SNeThe influence of rotation on the critical neutrino luminosity in core-collapse supernovaeGeneral relativistic magnetospheres of slowly rotating and oscillating neutron starsHost galaxies of short GRBsGRB 100418A: a bridge between GRB-associated hypernovae and SNeTwo super-luminous SNe at z ~ 1.5 from the SNLSProspects for very-high-energy gamma-ray bursts with the Cherenkov Telescope ArrayThe dynamics and radiation of relativistic flows from massive starsThe search for light echoes from the supernova explosion of 1181 ADThe proto-magnetar model for gamma-ray burstsStellar black holes at the dawn of the universeMAXI J0158-744: the discovery of a supersoft X-ray transientWide-band spectra of magnetar burst emissionDust formation and evolution in envelope-stripped core-collapse supernovaeThe host galaxies of dark gamma-ray burstsKeck observations of 150 GRB host galaxiesSearch for properties of GRBs at large redshiftThe early emission from SNeSpectral properties of SN shock breakoutMAXI observation of GRBs and short X-ray transientsA three-dimensional view of SN 1987A using light echo spectroscopyX-ray study of the southern extension of the SNR Puppis AAll-sky survey of short X-ray transients by MAXI GSCDevelopment of the CALET gamma-ray burst monitor (CGBM)

A concept for a lightweight, low-power and sensitive Silicon-based All Sky Monitor for transient sources and Gamma Ray Bursts

2010 ◽  
Author(s):  
R. Campana ◽  
L. Pacciani ◽  
M. Feroci ◽  
E. Costa ◽  
E. Del Monte ◽  
...  
Keyword(s):  
Low Power ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Transient Sources ◽  
Sky Monitor ◽  
Silicon Based

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

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.

scholarly journals Localizations of 13 Gamma‐Ray Bursts by the All‐Sky Monitor on theRossi X‐Ray Timing Explorer

1999 ◽  
Vol 526 (2) ◽  
pp. 683-696 ◽  
Author(s):  
D. A. Smith ◽  
A. M. Levine ◽  
H. V Bradt ◽  
R. Remillard ◽  
J. G. Jernigan ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
X Ray ◽  
Sky Monitor

The spectral properties of the GRB prompt gamma-ray emission observed by the Suzaku Wide-band All-sky Monitor

2008 ◽  
Author(s):  
M. Ohno ◽  
T. Uehara ◽  
T. Takahashi ◽  
Y. Fukazawa ◽  
C. Kira ◽  
...  
Keyword(s):  
Spectral Properties ◽  
Gamma Ray ◽  
Wide Band ◽  
Prompt Gamma ◽  
Gamma Ray Emission ◽  
Sky Monitor
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