Spectral Properties of Prompt Emission of Four Short Gamma-Ray Bursts Observed by the Suzaku-WAM and the Konus-Wind

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• arXiv:0801.2432v1 [astro-ph] http://arxiv.org/abs/0801.2432We have performed a joint analysis of prompt emission from four bright short gamma-ray bursts (GRBs) with the Suzaku-WAM and the Konus-Wind experiments. This joint analysis allows us to investigate the spectral properties of short-duration bursts over a wider energy band with a higher accuracy. We find that these bursts have a high E-peak, around 1 MeV and have a harder power-law component than that of long GRBs. However, we can not determine whether these spectra follow the cut-off power-law model or the Band model. We also investigated the spectral lag, hardness ratio, inferred isotropic radiation energy and existence of a soft emission hump, in order to classify them into short or long GRBs using several criteria, in addition to the burst duration. We find that all criteria, except for the existence of the soft hump, support the fact that our four GRB samples are correctly classified as belonging to the short class. In addition, our broad-band analysis revealed that there is no evidence of GRBs with a very large hardness ratio, as seen in the BATSE short GRB sample, and that the spectral lag of our four short GRBs is consistent with zero, even in the MeV energy band, unlike long GRBs. Although our short GRB samples are still limited, these results suggest that the spectral hardness of short GRBs might not differ significantly from that of long GRBs, and also that the spectral lag at high energies could be a strong criterion for burst classification.

• 2008-02-20

著者

• 田代 信

  埼大理

• TASHIRO Makoto

  Department of Physics, Saitama University

• OHNO Masanori

  Department of Physical Sciences, School of Science, Hiroshima University

• FUKAZAWA Yasushi

  Department of Physical Sciences, School of Science, Hiroshima University

• TAKAHASHI Takuya

  Department of Physical Sciences, School of Science, Hiroshima University

• YAMAOKA Kazutaka

  Department of Physics and Mathematics, Aoyama Gakuin University

• SUGITA Satoshi

  Department of Physics and Mathematics, Aoyama Gakuin University

• FREDERIKS Dmitry

  Ioffe Physico-Technical Institute, Laboratory for Experimental Astrophysics

• OLEYNIK Philipp

  Ioffe Physico-Technical Institute, Laboratory for Experimental Astrophysics

• ULANOV Mikhail

  Ioffe Physico-Technical Institute, Laboratory for Experimental Astrophysics

• SAKAMOTO Takanori

  NASA Goddard Space Flight Center

• SATO Goro

  NASA Goddard Space Flight Center

• HURLEY Kevin

  University of California, Berkeley, Space Sciences Laboratory

• URATA Yuji

  Department of Physics, Saitama University

• ONDA Kaori

  Department of Physics, Saitama University

• TAMAGAWA Toru

  Institute of Physical and Chemical Research (RIKEN)

• TERADA Yukikatsu

  Institute of Physical and Chemical Research (RIKEN)

• SUZUKI Motoko

  Institute of Physical and Chemical Research (RIKEN)

• SOOJING Hong

  Laboratory of Physics College of Science and Technology, Nihon University

• UEDA Yoshihiro

  Department of Astronomy, Kyoto University

• Sakamoto Takanori

  Nasa Md Usa

• Sugizaki M

  Iss Science Project Office Isas Jaxa

• Tsuru Takeshi

  Kyoto Univ. Kyoto Jpn

• Takeshima T

  Department Of Physics Faculty Of Science Kyoto University

• Sugizaki M

  The Institute Of Space And Astronautical Science

• Sugizaki Mutsumi

  Cosmic Radiation Laboratory Riken

• Hong Soojing

  College Of Science And Technology Nihon University

• YAMAOKA Kazutaka

  Dept. of Physics, Aoyama Gakuin University

• UEDA Yoshihiro

  The Institute of Space and Astronautical Science

• MIHARA Tatehiro

  The Institute of Physical and Chemical Research

• Takei Yoh

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Ulanov Mikhail

  Ioffe Physico-technical Institute Laboratory For Experimental Astrophysics

• Tsuru Takeshi

  Department Of Physics Graduate School Of Science Kyoto University

• Ueda Y

  Kyoto Univ. Kyoto

• Soojing Hong

  Laboratory Of Physics College Of Science And Technology Nihon University

• Sugita Satoshi

  Nagoya Univ. Nagoya

• SUGITA Satoshi

  EcoTopia Science Institute, Nagoya University

• Pal'shin Valentin

  Laboratory For Experimental Astrophysics Ioffe Physico-technical Institute

• Urata Yuji

  Department Of Physics Saitama University

• Yasuda Tatsuki

  Faculty Of Science Kagoshima University

• Ozaki M

  Institute Of Space And Astronautical Science Jaxa

• Ozaki Masanobu

  和歌山県立医科大学 薬理学教室

• TAKAHASHI Tadayuki

  ISAS

• KOMIYAMA Yutaka

  National Astronomical Observatory of Japan

• Ohno Masanori

  Japan Aerospace Exploration Agency Sagamihara

• OHNO Masanori

  Dep. of Phys., Hiroshima University

• Yamada Kazuhiko

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Yamaoka Kazutaka

  Aoyama Gakuin Univ. Sagamihara

• Urata Yuji

  Academia Sinica Taipei Twn

• Totani T

  Kyoto Univ. Kyoto

• Komiyama Yutaka

  Subaru Telescope National Astronomical Observatory

• Taguchi Tomoyuki

  Department Of Physics Kyoto University

• Onda Kaori

  Department Of Physics Saitama University

• Ozaki Masanobu

  Institute Of Space And Astronautical Science Jaxa

• Ohno Masanori

  Department Of Biotechnology And Biomaterial Chemistry Graduate School Of Engineering Nagoya Universi

• Yamaoka Kazutaka

  Department Of Physics And Mathematics Aoyama Gakuin University

• Fukazawa Y

  Department Of Physical Science Hiroshima University

• Oleynik Philipp

  Ioffe Physico-technical Institute Laboratory For Experimental Astrophysics

• Fukazawa Yasushi

  Department Of Physical Science Hiroshima University

• Frederiks Dmitry

  Ioffe Physico-technical Institute Laboratory For Experimental Astrophysics

• Hurley K.

  Space Sciences Laboratory University Of California

• Hurley Kevin

  University Of California Berkeley Space Sciences Laboratory

• Suzuki Motoko

  Inst. Physical And Chemical Res. (riken) Saitama

• Hong Soojing

  Nihon Univ. Chiba

• Sato Shizuka

  Department Of Physics Nagoya University

• Ohno Masanori

  Institute Of Space And Astronautical Science Japan Aerospace Exploration Agency

• Sugita Satoshi

  Department Of Physics And Mathematics Aoyama Gakuin University

• Terashima Yuichi

  Department Of Physics Nagoya University

• Sawada Makoto

  Kyoto Univ. Kyoto

• Shimokawabe Takashi

  Goddard Space Flight Center Nasa

• Tashiro Makoto

  Department Of Astronomy And Astrophysics Pennsylvania State University

• Tamagawa Toru

  Department Of Geoscience Joetsu University Of Education

• Takahashi Takuya

  Department Of Applied Biological Chemistry College Of Agriculture Osaka Prefecture University

• Sugita Satoshi

  Department Of Molecular Medicine And Metabolism Medical Research Institute Tokyo Medical And Dental

• SUGIZAKI Mutsumi

  MAXI team, Institute of Physical and Chemical Research (RIKEN)

• SATO Goro

  Institute of Space and Astronautical Science (ISAS/JAXA)

• Pal'shin Valentin

  Ioffe Physico-technical Institute Laboratory For Experimental Astrophysics

• Urata Yuji

  Department Of Astronomy Kyoto University

• SATO Goro

  NASA GSFC:ISAS, JAXA

• Hurley Kevin

  Space Sciences Laboratory, University of California

• Ozaki Masanobu

  JAXA/Institute of Space and Astronautical Science

• Sakamoto Takanori

  Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center

• OZAKI Masanobu

  Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)

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