Jaunsen, A. O., Rol, E., Watson, D. J., Malesani, D., Fynbo, J. P. U., Milvang-Jensen, B., Hjorth, J., Vreeswijk, P. M., Ovaldsen, J. -E., Wiersema, K., Tanvir, N. R., Gorosabel, J., Levan, A. J., Schirmer, M. and Castro-Tirado, A. J.. (2008) GRB 070306: A highly extinguished afterglow. Astrophysical Journal, Vol.681 (No.1). pp. 453-461. ISSN 0004-637X

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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
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Date:	1 July 2008
Volume:	Vol.681
Number:	No.1
Number of Pages:	9
Page Range:	pp. 453-461
Identification Number:	10.1086/588602
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
URI:	http://wrap.warwick.ac.uk/id/eprint/29771

Data sourced from Thomson Reuters' Web of Knowledge

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