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2002 Fiscal Year Final Research Report Summary

Study of Gamma-Ray Bursts and Afterglows using HETE-2 Satellite

Research Project

Project/Area Number 13440063
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionAOYAMA GAKUIN UNIVERSITY

Principal Investigator

YOSHIDA Atsumasa  Aoyama Gakuin University, College of Science and Engineering, Associate Professor, 理工学部, 助教授 (80240274)

Co-Investigator(Kenkyū-buntansha) TAMAGAWA Toru  RIKEN (The Institute of Physical and Chemical Research), Research Scientist, 宇宙放射線研究室, 研究員 (20333312)
KAWAI Nobuyuki  Tokyo Institute of Technology, Professor, 大学院・理工学研究科, 教授 (80195031)
SHIBATA Toru  Aoyama Gakuin University, College of Science and Engineering, Associate Professor, 理工学部, 助教授 (70082831)
Project Period (FY) 2001 – 2002
KeywordsGamma-Ray Burst / GRB afterglow / HETE-2 / GCN
Research Abstract

The HETE-2 satellite is a small astronomical satellite for mainly studying gamma-ray bursts (GRBs). It was launched on 9^<th> of October in 2000. After having tested functioning of the instruments and adjusted the on-board software during May through August, HETE-2 began steady observations in midsummer of 2001. The satellite operation, maintaining the scientific instruments and quick-look analyses are conducted by the HETE-2 operation team at Mission Operation Center in MIT together with the Japanese team, staffs and graduate students in RIKEN, AGU, Tokyo Tech and NAO. The three scientific instruments are normally working except for one out of four counters in the X-ray detector, of which function was lost by an accident perhaps due to an encounter with a small space debris.
HETE-2 successfully localizes GRB locations and sends prompt notifications to ground observers with delay of a few tens of seconds which is three orders of magnitude faster than that of previous experiments such as BeppoSAX. Thereby early afterglows have been observable and it is found that some show very quick decay in time and others display complex structure in their early light curves.
Remarkable observational result recently made is that the discovery of a spectral component of Type Ic Supernova in optical spectra of GRB030329 afterglow. This results in compelling evidence of association between GRBs and SNs.
The scientific instruments carried by HETE-2 are all sensitive to X-ray below 10 keV, and hereby many X-ray Rich GRBs and X-ray Flashes are detected. The observational data accumulated by HETE-2 suggest that these phenomena have similar properties and thereby a same astrophysical origin.
HETE-2 also discovered an unknown zone of high density charged particles around the equator above Ecuador which displayed time variability correlated with the solar activity.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] G.Ricker, N.Kawai, T.Tamagawa, A.Yoshida, et al.: "GRB 010921:Localization and Observations by the High Energy Transient Explorer Satellite"The Astrophysical Journal. 571. L127-L130 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Crew, N.Kawai, T.Tamagawa, A.Yoshida, et al.: "HETE-2 Localization and Observation of the Bright, X-Ray-rich Gamma-Ray Burst GRB 021211"The Astrophysical Journal. 599. 387-393 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] C.Barraud, J-L.Atteia, N.Kawai, T.Tamagawa, A.Yoshida, et al.: "Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE"Astronomy and Astrophysics. 400. 1021-1030 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Shirasaki, N.Kawai, A.Yoshida, et al.: "Design and Performance of the Wide-Field X-Ray Monitor on Board the High-Energy Transient Explorer 2"Publications of the Astronomical Society of Japan. 55. 1033-1049 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Yoshida, Y.E.Nakagawa, N.Kawai, T.Tamagawa, et al.: ""Classical" GRBs Seen by HETE-2 Satellite"Proceedings of the 28th International Cosmic Ray Conference. Vol.5. 2693-2696 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.E.Nakagawa, T.Tamagawa, A.Yoshida, N.Kawai, et al.: "An Unusual Time-Variable High Radiation Region seen by HETE-2 Satellite"Proceedings of the 28th International Cosmic Ray Conference. Vol.7. 4261-4264 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Ricker, N.Kawai, T.Tamagawa, A.Yoshida, et al.: "GRB 010921 : Localization and Observations by the High Energy Transient Explorer Satellite"The Astrophysical Journal. 571. L127-L130 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.Crew, N.Kawai, T.Tamagawa, A.Yoshida, et al.: "HETE-2 Localization and Observation of the Bright, X-Ray-rich Gamma-Ray Burst GRB 021211"The Astrohysical Journa1. 599. 387-393 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] C.Barraud, J-L.Atteia, N.Kawai, T.Tamagawa, A.Yoshida, et al.: "Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE"Astronomy and Astrophysics. 400. 1021-1030 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Shirasaki, N.Kawai, A.Yoshida, et al.: "Design and Performance of the Wide-Field X-Ray Monitor on Board the High-Energy Transient Explorer 2"Publications of the Astronomical Society of Japan. 55. 1033-1049 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Yoshida, Y.E.Nakagawa, N.Kawai, T.Tamagawa, et al.: "'Classical' GRBs Seen by HETE-2 Satellite"Proceedings of the 28th International Cosmic Ray Conference. Vol.5. 2693-2696 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.E.Nakagawa, T.Tamagawa, A.Yoshida, N.Kawai, et al.: "An Unusual Time-Variable High Radiation Region seen by HETE-2 Satellite"Proceedings of the 28th International Cosmic Ray Conference. Vol.7. 4261-4264 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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