HETE-2 localization and observations of the gamma-ray burst GRB 020813

Rie Sato, Takanori Sakamoto, Jun Kataoka, Atsumasa Yoshida, Motoko Suzuki, Junichi Kotoku, Yuji Urata, Yoshihisa Yamamoto, Makoto Arimoto, Toru Tamagawa, Yuji Shirasaki, Ken'ichi Torii, Masaru Matsuoka, Yujin Nakagawa, Toru Yamazaki, Kaoru Tanaka, Miki Maetou, Makoto Yamauchi, Kunio Takagishi, Donald Q. LambJean Luc Atteia, Roland Vanderspek, Carlo Graziani, Gregory Prigozhin, Joel Villasenor, J. Garrett Jernigan, Geoffrey B. Crew, Kevin Hurley, George R. Ricker, Stanford E. Woosley, Nat Butler, Al Levine, John P. Doty, Timothy Q. Donaghy, Edward E. Fenimore, Mark Galassi, Michel Boer, Jean Pascal Dezalay, Jean François Olive, Joao Braga, Ravi Manchanda, Graziella Pizzichini, Nobuyuki Kawai

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A bright, long gamma-ray burst (GRB) was detected and localized by the instruments on board the High Energy Transient Explorer 2 satellite (HETE-2) at 02:44:19.17 UTC (9859.17 s UT) on 2002 August 13. The location was reported to the GRB Coordinates Network (GCN) about 4 min after the burst. In the prompt emission, the burst had a duration of approximately 125 s, and more than four peaks. We analyzed the time-resolved 2-400 keV energy spectra of the prompt emission of GRB 020813 using the Wide Field X-Ray Monitor (WXM) and the French Gamma Telescope (FREGATE) in detail. We found that the early part of the burst (17-52 s after the burst trigger) shows a depletion of low-energy photons below about 50 keV. It is difficult to explain the depletion by either synchrotron self-absorption or Comptonization. One possibility is that the low-energy depletion may be understood as a mixture of "jitter" radiation with the usual synchrotron radiation component.

Original languageEnglish
Pages (from-to)1031-1039
Number of pages9
JournalPublications of the Astronomical Society of Japan
Volume57
Issue number6
DOIs
Publication statusPublished - 2005

Keywords

  • Gamma-rays: bursts

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Sato, R., Sakamoto, T., Kataoka, J., Yoshida, A., Suzuki, M., Kotoku, J., Urata, Y., Yamamoto, Y., Arimoto, M., Tamagawa, T., Shirasaki, Y., Torii, K., Matsuoka, M., Nakagawa, Y., Yamazaki, T., Tanaka, K., Maetou, M., Yamauchi, M., Takagishi, K., ... Kawai, N. (2005). HETE-2 localization and observations of the gamma-ray burst GRB 020813. Publications of the Astronomical Society of Japan, 57(6), 1031-1039. https://doi.org/10.1093/pasj/57.6.1031