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GRB060206 and the quandary of achromatic breaks in afterglow light curves


Curran, PA and van der Horst, AJ and Wijers, RAMJ and Starling, RLC and Castro-Tirado, AJ and Fynbo, JPU and Gorosabel, J and Jarvinen, AS and Malesani, D and Rol, E and Tanvir, NR and Wiersema, K and Burleigh, MR and Casewell, SL and Dobbie, PD and Guziy, S and Jakobsson, P and Jelinek, M and Laursen, P and Leven, AJ and Mundell, CG and Naranen, J and Piranomonte, S, GRB060206 and the quandary of achromatic breaks in afterglow light curves, Royal Astronomical Society. Monthly Notices. Letters (Online), 381, (1) pp. L65-L69. ISSN 1745-3933 (2007) [Refereed Article]

Copyright Statement

Copyright 2007 the authors

DOI: doi:10.1111/j.1745-3933.2007.00368.x


Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared with the BeppoSAX era. We present our multi-wavelength analysis of GRB 060206 as an illustrative example of how inferences of jet breaks from optical and X-ray data might differ. The results of temporal and spectral analyses are compared, and attempts are made to fit the data within the context of the standard blast wave model. We find that while the break appears more pronounced in the optical and evidence for it from the X-ray alone is weak, the data are actually consistent with an achromatic break at about 16 h. This break and the light curves fit standard blast wave models, either as a jet break or as an injection break. As the pre-Swift sample of afterglows are dominated by optical observations, and in the Swift era most well-sampled light curves are in the X-ray, caution is needed when making a direct comparison between the two samples, and when making definite statements on the absence of achromatic breaks.

Item Details

Item Type:Refereed Article
Keywords:radiation mechanisms: non-thermal; gamma-rays: bursts; X-rays: individual: GRB 060206
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:High energy astrophysics and galactic cosmic rays
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81081
Year Published:2007
Web of Science® Times Cited:23
Deposited By:Mathematics and Physics
Deposited On:2012-11-22
Last Modified:2013-06-26

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