HETE-2 Localization and Observations of the Gamma-Ray Burst GRB 020813
| Autor: | J. P. Dezalay, Motoko Suzuki, Geoffrey B. Crew, N. Butler, M. Galassi, Y. Urata, Jean François Olive, Y. Yamamoto, M. Maetou, Makoto Arimoto, João Braga, Yuji Shirasaki, Atsumasa Yoshida, Al Levine, George R. Ricker, Jean-Luc Atteia, Jun Kataoka, Ken'ichi Torii, D. Q. Lamb, Toru Tamagawa, Edward E. Fenimore, R. K. Manchanda, Nobuyuki Kawai, Rie Sato, G. Pizzichini, Toru Yamazaki, Gregory Y. Prigozhin, J. Kotoku, Roland Vanderspek, John P. Doty, Yujin E. Nakagawa, Masaru Matsuoka, K. Tanaka, T. Q. Donaghy, S. E. Woosley, Carlo Graziani, Joel Villasenor, Makoto Yamauchi, J. Garrett Jernigan, Kevin Hurley, Michel Boer, K. Takagishi, T. Sakamoto |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 2053-051X 0004-6264 |
| Popis: | 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 (9859.17s UT) on 2002 August 13. The location was reported to the GRB Coordinates Network (GCN) about 4min after the burst. In the prompt emission, the burst had a duration of approximately 125s, and more than four peaks. We analyzed the time-resolved 2-400keV 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 (17-52s after the burst trigger) shows a depletion of low-energy photons below about 50keV. 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. |
| Databáze: | OpenAIRE |
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