Melandri 2008 伽玛暴早期光学余辉统计

主要内容:
给出了63个暴的早期光学余辉（这些是最近所能看到的）

精彩摘抄:

四种光学和X-ray光变的可能情形，示意图

文章信息:

· arXiv e-print (arXiv:0804.0811)

· References in the Article

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Title:		The Early-time Optical Properties of Gamma-Ray Burst Afterglows
Authors:		Melandri, A.; Mundell, C. G.; Kobayashi, S.; Guidorzi, C.; Gomboc, A.; Steele, I. A.; Smith, R. J.; Bersier, D.; Mottram, C. J.; Carter, D.; Bode, M. F.; O'Brien, P. T.; Tanvir, N. R.; Rol, E.; Chapman, R.
Publication:		eprint arXiv:0804.0811
Publication Date:		04/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		51 pages, 9 figures, 4 tables, submitted to ApJ
Bibliographic Code:		2008arXiv0804.0811M

Abstract

We present a multiwavelength analysis of 63 Gamma-Ray Bursts observed with the world's three largest robotic optical telescopes, the Liverpool and Faulkes Telescopes (North and South). Optical emission was detected for 24 GRBs with brightnesses ranging from R = 10 to 22 mag in the first 10 minutes after the burst. By comparing optical and X-ray light curves from t = 100 to about 10^6 seconds, we introduce four main classes, defined by the presence or absence of temporal breaks at optical and/or X-ray wavelengths. While 15/24 GRBs can be modelled with the forward-shock model, explanation of the remaining nine is very challenging in the standard framework even with the introduction of energy injection or an ambient density gradient. Early X-ray afterglows, even segments of light curves described by a power-law, may be due to additional emission from the central engine. 39 GRBs in our sample were not detected and have deep upper limits (R <> Bibtex entry for this abstract Preferred format for this abstract (see Preferences)