Observation of GRB 051022 detected by HETE-2

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

Research output: Contribution to journalArticlepeer-review


An "optically dark" burst GRB 051022 was detected by GRB 051022 was detected by HETE-2. The detections of candidate X-ray and radio afterglows were reported, whereas no optical afterglow was found in spite of quick follow-up observations. The optical spectroscopic observations of the host galaxy revealed the redshift z = 0.8. Using the data derived by HETE-2 observation of the prompt emission, we found the constant absorption N H = 8.8-2.9+3.1 × 1022 cm -2 and the visual extinction AV = 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 the Swift XRT observations of the afterglow is fully consistent with those obtained from the early HETE-2 observation. Our analysis implies an interpretation that the absorbing medium may be outside the external shock at R ≥ 1016 cm, which could be a dusty molecular cloud.

Original languageEnglish (US)
Pages (from-to)1535-1537
Number of pages3
JournalNuovo Cimento della Societa Italiana di Fisica B
Issue number12
StatePublished - Dec 2006
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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