Krühler, T. 2009 GRB 080710的余辉观测

主要内容:
可能是一个偏轴的暴.

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Title:		The bright optical/NIR afterglow of the faint GRB 080710 - Evidence for a jet viewed off axis
Authors:		Krühler, T.; Greiner, J.; Afonso, P.; Burlon, D.; Clemens, C.; Filgas, R.; Kann, D. A.; Klose, S.; Küpcü Yoldas, A.; McBreen, S.; Olivares, F.; Rau, A.; Rossi, A.; Schulze, S.; Szokoly, G. P.; Updike, A.; Yoldas, A.
Publication:		eprint arXiv:0908.2250
Publication Date:		08/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		9 pages, 4 figures, accepted by A and A
Bibliographic Code:		2009arXiv0908.2250K

Abstract

We investigate the optical/near-infrared light curve of the afterglow of GRB 080710 in the context of rising afterglows. Optical and near-infrared photometry was performed using the seven channel imager GROND and the Tautenburg Schmidt telescope. X-ray data were provided by the X-ray Telescope onboard the Swift satellite. The optical/NIR light curve of the afterglow of GRB 080710 is dominated by an initial increase in brightness, which smoothly turns over into a shallow power law decay. The initially rising achromatic light curve of the afterglow of GRB 080710 can be accounted for with a model of a burst viewed off-axis or a single jet in its pre deceleration phase and in an on-axis geometry. An unified picture of the afterglow light curve and prompt emission properties can be obtained with an off-axis geometry, suggesting that late and shallow rising optical light curves of GRB afterglows might be produced by geometric effects.

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