An Optically Dark GRB Observed by HETE-2: GRB 051022

Nakagawa, Y. E.; Yoshida, A.; Sugita, S.; Tanaka, K.; Ishikawa, N.; Tamagawa, T.; Suzuki, M.; Shirasaki, Y.; Kawai, N.; Matsuoka, M.; Atteia, J.-L.; Pelangeon, A.; Vanderspek, R.; Crew, G. B.; Villasenor, J. S.; Butler, N.; Doty, J. P.; Ricker, G. R.; Pizzichini, G.; Donaghy, T. Q.; Lamb, D. Q.; Graziani, C.; Sato, R.; Maetou, M.; Arimoto, M.; Kotoku, J.; Jernigan, J. G.; Sakamoto, T.; Olive, J.-F.; Boer, M.; Fenimore, E. E.; Galassi, M.; Woosley, S. E.; Yamauchi, M.; Takagishi, K.; Hatsukade, I.

doi:10.1093/pasj/58.4.L35

論文・著書情報

タイトル

和文:
英文:	An Optically Dark GRB Observed by HETE-2: GRB 051022

著者

和文:

Nakagawa, Y. E., Yoshida, A., Sugita, S., Tanaka, K., Ishikawa, N., Tamagawa, T., Suzuki, M., Shirasaki, Y., 河合誠之, Matsuoka, M., Atteia, J.-L., Pelangeon, A., Vanderspek, R., Crew, G. B., Villasenor, J. S., Butler, N., Doty, J. P., Ricker, G. R., Pizzichini, G., Donaghy, T. Q., Lamb, D. Q., Graziani, C., Sato, R., Maetou, M., 有元誠, Kotoku, J., Jernigan, J. G., Sakamoto, T., Olive, J.-F., Boer, M., Fenimore, E. E., Galassi, M., Woosley, S. E., Yamauchi, M., Takagishi, K., Hatsukade, I..

英文:

Nakagawa, Y. E., Yoshida, A., Sugita, S., Tanaka, K., Ishikawa, N., Tamagawa, T., Suzuki, M., Shirasaki, Y., Kawai, N., Matsuoka, M., Atteia, J.-L., Pelangeon, A., Vanderspek, R., Crew, G. B., Villasenor, J. S., Butler, N., Doty, J. P., Ricker, G. R., Pizzichini, G., Donaghy, T. Q., Lamb, D. Q., Graziani, C., Sato, R., Maetou, M., Arimoto, M., Kotoku, J., Jernigan, J. G., Sakamoto, T., Olive, J.-F., Boer, M., Fenimore, E. E., Galassi, M., Woosley, S. E., Yamauchi, M., Takagishi, K., Hatsukade, I..

言語

English

掲載誌/書名

和文:
英文:	Publications of the Astronomical Society of Japan

巻, 号, ページ

Vol. 58 pp. L35-L39

出版年月

2006年8月

出版者

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英文:

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和文:
英文:

開催地

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英文:

DOI

https://doi.org/10.1093/pasj/58.4.L35

アブストラクト

GRB 051022 was detected at 13:07:58 on 2005 October 22 UT by HETE-2. The location of GRB 051022 was determined immediately by the flight localization system. This burst contained multiple pulses, and had a rather long duration of about 190s. The detections of candidate X-ray and radio afterglows were reported, whereas no optical afterglow was found. Optical spectroscopic observations of the host galaxy revealed a redshift of z = 0.8. Using data derived by a HETE-2 observation of the prompt emission, we found absorption of N_H = (8.8_-2.9^+3.1) × 10²² cm^-2 and visual extinction of A_V = 49_-16⁺¹⁷ mag in the host galaxy. If this is the case, no detection of any optical transient would be quite reasonable. The absorption derived by Swift XRT observations of the afterglow is fully consistent with those obtained from an early HETE-2 observation of the prompt emission. Our analysis implies an interpretation that the absorbing medium may be outside the external shock at R ˜ 10¹⁶cm, which could be a dusty molecular cloud.

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