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

被引:5
|
作者
Sato, R [1 ]
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
Lamb, DQ
Atteia, JL
Vanderspek, R
Graziani, C
Prigozhin, G
Villasenor, J
Jernigan, JG
Crew, GB
Hurley, K
Ricker, GR
Woosley, SE
Butler, N
Levine, A
Doty, JP
Donaghy, TQ
Fenimore, EE
Galassi, M
Boer, M
Dezalay, JP
Olive, JF
Braga, J
Manchanda, R
Pizzichini, G
Kawai, N
机构
[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[3] RIKEN, Wako, Saitama 3510198, Japan
[4] Aoyama Gakuin Univ, Dept Phys, Sagamihara, Kanagawa 2298558, Japan
[5] Natl Astron Observ, Mitaka, Tokyo 1818588, Japan
[6] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan
[7] JAXA, Tsukuba, Ibaraki 3048505, Japan
[8] Miyazaki Univ, Fac Engn, Miyazaki, Miyazaki 8992192, Japan
[9] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
[10] Observ Midi Pyrenees, Astrophys Lab, F-31400 Toulouse, France
[11] MIT, CSR, Cambridge, MA 02139 USA
[12] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[13] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[14] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[15] Observ Midi Pyrenees, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France
[16] Inst Nacl Pesquisas Espaciais, BR-12227010 Sao Jose Dos Campos, Brazil
[17] Tata Inst Fundamental Res, Dept Astron & Astrophys, Bombay 400005, Maharashtra, India
[18] INAF, IASF, Sez Bologna, I-40129 Bologna, Italy
关键词
gamma-rays; bursts;
D O I
10.1093/pasj/57.6.1031
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:1031 / 1039
页数:9
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