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

  • Makoto S. Tashiro (a1), Kaori Onda (a1), Kazutaka Yamaoka (a2), Masahiro Ohno (a3), Satoshi Sugita (a4), Takeshi Uehara (a5) and Hiromi Seta (a6)...

Abstract

An 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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References

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Band, D. et al. 1993, ApJ 413, 281
Meszaros, P. & Rees, M. J. 2000, ApJ, 530, 292
Tashiro, M. et al. 2012, PASJ, 64, 26
Yamaoka, K. et al. 2009, PASJ, 61, S35
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Keywords

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

  • Makoto S. Tashiro (a1), Kaori Onda (a1), Kazutaka Yamaoka (a2), Masahiro Ohno (a3), Satoshi Sugita (a4), Takeshi Uehara (a5) and Hiromi Seta (a6)...

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