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GRB 070306: A highly extinguished afterglow
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Jaunsen, Andreas O., Rol, E., Watson, D. J., Malesani, D., Fynbo, J. P. U., Milvang-Jensen, B., Hjorth, J. (Jens), Vreeswijk, P. M., Ovaldsen, J. -E., Wiersema, K., Tanvir, Nial R., Gorosabel, J., Levan, A. J., Schirmer, M. and Castro-Tirado, A. J. (Alberto J.) (2008) GRB 070306: A highly extinguished afterglow. Astrophysical Journal, Volume 681 (Number 1). pp. 453-461. doi:10.1086/588602 ISSN 0004-637X.
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Official URL: http://iopscience.iop.org/0004-637X/681/1/453
Abstract
We report on the highly extinguished afterglow of GRB 070306 and the properties of the host galaxy. An optical afterglow was not detected at the location of the burst, but in near-infrared a doubling in brightness during the first night and later power-law decay in the K band provided a clear detection of the afterglow. The host galaxy is relatively bright, R similar to 22.8. An optical low-resolution spectrum revealed a largely featureless host galaxy continuum with a single emission line. Higher resolution follow-up spectroscopy shows this emission to be resolved and consisting of two peaks separated by 7 angstrom, suggesting it to be [O II] at a redshift of z - 1.49594 +/- 0.00006. The infrared color H - K = 2 directly reveals significant reddening. By modeling the optical/ X-ray spectral energy distribution at t = 1.38 days with an extinguished synchrotron spectrum, we derive A(V) 5.5 +/- 0.6 mag. This is among the largest values ever measured for a GRB afterglow, and visual extinctions exceeding unity are rare. The importance of early near-IR observations is obvious and may soon provide a clearer view into the once elusive ''dark bursts.''
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Afterglow (Physics), Gamma ray bursts, Cosmic dust | ||||
Journal or Publication Title: | Astrophysical Journal | ||||
Publisher: | IOP Publishing | ||||
ISSN: | 0004-637X | ||||
Official Date: | 1 July 2008 | ||||
Dates: |
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Volume: | Volume 681 | ||||
Number: | Number 1 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 453-461 | ||||
DOI: | 10.1086/588602 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Marie Curie Intra-European Fellowship (IEF), Danmarks Grundforskningsfond [Danish National Research Foundation], Spain. Ministerio de Ciencia e Innovación | ||||
Grant number: | MEIF-CT-2006-041363 (EU), ESP2005-07714-C03-03 and AYA2004-01515 (MCI) |
Data sourced from Thomson Reuters' Web of Knowledge
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