Prior Emission Model for X-ray Plateau Phase of Gamma-Ray Burst Afterglows - AstrophysicsReport as inadecuate




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Abstract: The two-component emission model to explain the plateau phase of the X-rayafterglows of gamma-ray bursts GRBs is proposed. One component, which isresponsible for the plateau and subsequent normal decay phase of the X-rayafterglow, is the prior emission via outflow ejected from the central enginebefore the main burst. The other is the main outflow, which causes the promptGRB emission and the initial steep decay phase of the X-ray afterglow. In thismodel, the transition from the plateau to the subsequent normal decay phase isan artifact of the choice of the zero of time. For events with distinct plateauphase, the central engine is active 10^3-10^4 sec before the launch of the mainoutflow. According to this model, a prior emission in the X-ray and-or opticalbands 10^3-10^4 sec before the prompt GRB emission is possibly seen, which willbe tested by near-future instruments such as Monitor of All-sky X-ray ImageMAXI, WIDe-field telescope for GRB Early Timing WIDGET, and so on.



Author: Ryo Yamazaki Hiroshima Univ.

Source: https://arxiv.org/







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