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

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2005年 / 57卷 / 06期

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

页码：1031 / 1039

页数：9

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