Curran 2007 Swift余辉的多波段同时拐折

主要内容:
Swift之前大部分是同时拐折的，但Swift的暴却好像不是。作者通过对GRB 060206多波段余辉（X射线和光学）分析，发现还是同时拐折的，这样也比较符合标准激波模型。

精彩摘抄:


文章信息
arXiv:0706.1188 [ps, pdf, other] :

Title: GRB 060206 and the quandary of achromatic breaks in afterglow light curves
Authors: P.A. Curran, A.J. van der Horst, R.A.M.J. Wijers, R.L.C. Starling, A.J. Castro-Tirado, J.P.U. Fynbo, J. Gorosabel, A.S. Jarvinen, D. Malesani, E. Rol, N.R. Tanvir, K. Wiersema, M.R. Burleigh, S.L. Casewell, P.D. Dobbie, S. Guziy, P. Jakobsson, M. Jelinek, P. Laursen, A.J. Levan, C.G. Mundell, J. Naranen, S. Piranomonte
Comments: 5 pages including 1 figure; submitted for publication in MNRAS Letters

Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared to the BeppoSAX era. We examine the effect of the fact that pre-Swift afterglow observations tend to be dominated by the optical, whereas in the Swift era most well sampled light curves are in the X-ray. We present our multi-wavelength analysis of GRB 060206 as an illustrative example to demonstrate the possible effect of this change. 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 hours. This break and the light curves fit standard blast wave models, either as a jet break or as an injection break. The Swift and pre-Swift samples of afterglows could well be consistent in their break behaviour, but the lack of accurate models for jet breaks and the dearth of well sampled late time optical light curves for Swift bursts preclude definitive statements on the matter.

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