Xin, L. P. 2011 GRB 090529A的光学和X射线的shallow decay

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Title:		The shallow-decay phase in both optical and x-ray afterglows of Swift GRB 090529A: Energy injection into a wind-type medium?
Authors:		Xin, L. P.; Pozanenko, A.; Kann, D. A.; Xu, D.; Gorosabel, J.; Leloudas, G.; Wei, J. Y.; Andreev, M.; Qin, S. F.; Ibrahimov, M.;Han, X. H.; de Ugarte Postigo, A.; Qiu, Y. L.; Deng, J. S.; Volnova, A.; Jakobsson, P.; Castro-Tirado, A. J.; Aceituno, F.;Fynbo, J. P. U.; Wang, J.; Sanchez-Ramirez, R.; Kouprianov, V.; Zheng, W. K.; Tello, J. C.; Wu, C.
Publication:		eprint arXiv:1202.0347
Publication Date:		02/2012
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		19pages,2gigures, submitted to MNRAS
Bibliographic Code:		2012arXiv1202.0347X

Abstract

The energy injection model is usually proposed to interpret the shallow-decay phase in Swift GRB X-ray afterglows. However, very few GRBs have simultaneous signatures of energy injection in their optical and X-ray afterglows. Here, we report optical observations of GRB 090529A from 2000 sec to $\sim10^6$ sec after the burst, in which an achromatic decay is seen at both wavelengths. The optical light curve shows a decay from 0.37 to 0.99 with a break at $\sim10^5$ sec. In the same time interval, the decay indices of the X-ray light curve changed from 0.04 to 1.2. Comparing these values with the closure relations, the segment after 3$\times10^{4}$ sec is consistent with the prediction of the forward shock in an ISM medium without any energy injection. The shallow-decay phase between 2000 to 3$\times10^{4}$ sec could be due to the external shock in a wind-type-like medium with an energy injection under the condition of $\nu_o < \nu_c < \nu_x$. However, the constraint of the spectral region is not well consistent with the multi-band observations. For this shallow-decay phase, other models are also possible, such as energy injection with evolving microphysical parameters, or a jet viewed off-axis,etc.

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