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Extremely Bright GRB160625B with Short-Soft Precursor and long-hard extended emission: Hints for long-term evolution of the GRB Ejecta

Published online by Cambridge University Press:  23 June 2017

Shu-Qing Zhong
Affiliation:
GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guangxi University, Nanning 530004, China Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China
Jing Lü
Affiliation:
GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guangxi University, Nanning 530004, China Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China
Hou-Jun Lü*
Affiliation:
GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guangxi University, Nanning 530004, China Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China
Hai-Ming Zhang
Affiliation:
GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guangxi University, Nanning 530004, China Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China
Xiao-Li Huang
Affiliation:
GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guangxi University, Nanning 530004, China Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China
En-Wei Liang
Affiliation:
GXU-NAOC Center for Astrophysics and Space Sciences, Department of Physics, Guangxi University, Nanning 530004, China Guangxi Key Laboratory for the Relativistic Astrophysics, Nanning 530004, China
*
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Abstract

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In this paper, we focus on studying the high energy emission of GRB 160625B. The lightcurve of prompt emission is composed of three episodes: short-soft precursor, hard main burst, and possible long extended emission. The spectra of first and third episode can be fitted by a multi-color blackbody and cutoff power-law model, respectively. However, the spectrum of second episode was contributed by both multi-color blackbody and cutoff power-law. One can estimate the Lorenz factor of jet of first two episodes by invoking photosphere model as Γ0 ~ 175 and 1694, respectively. It suggests that the ejecta of this case evolved from photosphere dominated initially to internal shock later. On the other hand, the optical emission is very bright during the second episode, which is likely a prompt optical emission. Finally, a more shallower normal decay segment appeared, which is consistent with standard external shock model.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

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