Panaitescu 2008 Swift的光学余辉统计

主要内容:
把光学余辉统计起来，分了四类：早期快上升的，早期慢上升的，有平台的和直接下降的。但没解决什么问题。有提出了一个统计关系：peak flux – peak epoch relation。

精彩摘抄:
光学余辉的三类：含上升的，纯下降，平台

文章信息:

· arXiv e-print (arXiv:0803.1872)

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Title:		Taxonomy of GRB optical light-curves: identification of a salient class of early afterglows
Authors:		Panaitescu, A.; Vestrand, W. T.
Publication:		eprint arXiv:0803.1872
Publication Date:		03/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		8 pages, submitted to MNRAS
Bibliographic Code:		2008arXiv0803.1872P

Abstract

The temporal behaviour of the early optical emission from Gamma-Ray Burst afterglows can be divided in four classes: fast-rising with an early peak, slow-rising with a late peak, flat plateaus, and rapid decays since first measurement. The fast-rising optical afterglows display correlations among peak flux, peak epoch, and post-peak power-law decay index that can be explained with a structured outflow seen off-axis, but the shock origin (reverse or forward) of the optical emission cannot be determined. The afterglows with plateaus and slow-rises may be accommodated by the same model, if observer location offsets are larger than for the fast-rising afterglows, or could be due to a long-lived injection of energy and/or ejecta in the blast-wave. If better calibrated with more afterglows, the peak flux-peak epoch relation exhibited by the fast and slow-rising optical light-curves could provide a way to use this type of afterglows as standard candles.

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