Yamazaki 2008 Prior Emission Model for shallow decay

主要内容:
two component model: one is prior, for shallow decay(?), another one is the normal one, for prompt and normal decay.

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Title:		Prior Emission Model for X-ray Plateau Phase of Gamma-Ray Burst Afterglows
Authors:		Yamazaki, Ryo
Publication:		eprint arXiv:0810.1089
Publication Date:		10/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		12 pages, 2 figures
Bibliographic Code:		2008arXiv0810.1089Y

Abstract

The two-component emission model to explain the plateau phase of the X-ray afterglows of gamma-ray bursts (GRBs) is proposed. One component, which is responsible for the plateau and subsequent steep decay phase of the X-ray afterglow, is the prior emission via outflow ejected from the central engine before the main burst. The other is the main outflow, which causes the prompt GRB emission and the initial steep decay phase of the X-ray afterglow. In this model, the transition from the plateau to subsequent steep decay phase is an artifact of the choice of the zero of time. For events with distinct plateau phase, the central engine is active 10^3-10^4 sec before the launch of the main outflow. According to this model, a prior emission in the X-ray and/or optical bands 10^3-10^4 sec before the prompt GRB emission is possibly seen, which will be tested by near-future instruments such as Monitor of All-sky X-ray Image (MAXI), WIDe-field telescope for GRB Early Timing (WIDGET), and so on.

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