Optical light curve of GRB 121011A:a textbook for the onset of GRB afterglow in a mixture of ISM and wind-type medium

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	Optical light curve of GRB 121011A:a textbook for the onset of GRB afterglow in a mixture of ISM and wind-type medium
	Xin Liping; Wei Jianyan; Qiu Yulei; Deng Jinsong; Wang Jing; Han Xuhui
刊名	Research in Astronomy and Astrophysics
	2016
卷号	16 期号:1 页码:12
ISSN号	1674-4527
英文摘要	We report the optical observations of GRB 121011A by the 0.8m TNT facility at Xinglong observatory, China. The light curve of the optical afterglow shows a smooth and featureless bump during the epoch of ~130 s and ~5000 s with a rising index of 1.57±0.28 before the break time of 539±44 s, and a decaying index of about 1.29 ± 0.07 up to the end of our observations. Moreover, the X-ray light curve decays in a single power-law with a slope of about 1.51± 0.03 observed by XRT onboard Swift from 100 s to about 10 000 s after the burst trigger. The featureless optical light curve could be understood as an onset process under the external-shockmodel. The typical frequency has been below or near the optical one before the deceleration time, and the cooling frequency is located between the optical and X-ray wavelengths. The external medium density has a transition from a mixed stage of ISM and wind-type medium before the peak time to the ISM at the later phase. The joint-analysis of X-ray and optical light curves shows that the emissions from both frequencies are consistent with the prediction of the standard afterglow model without any energy injections, indicating that the central engine has stopped its activity and does not restart anymore after the prompt phase.
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/49257]
专题	中国科学院国家天文台
作者单位	中国科学院国家天文台
推荐引用方式 GB/T 7714	Xin Liping,Wei Jianyan,Qiu Yulei,et al. Optical light curve of GRB 121011A:a textbook for the onset of GRB afterglow in a mixture of ISM and wind-type medium[J]. Research in Astronomy and Astrophysics,2016,16(1):12.
APA	Xin Liping,Wei Jianyan,Qiu Yulei,Deng Jinsong,Wang Jing,&Han Xuhui.(2016).Optical light curve of GRB 121011A:a textbook for the onset of GRB afterglow in a mixture of ISM and wind-type medium.Research in Astronomy and Astrophysics,16(1),12.
MLA	Xin Liping,et al."Optical light curve of GRB 121011A:a textbook for the onset of GRB afterglow in a mixture of ISM and wind-type medium".Research in Astronomy and Astrophysics 16.1(2016):12.