Racusin 2011 Fermi和Swift暴的余辉统计

主要内容:
把这些暴拿过来一起统计，有多个量。

精彩摘抄:

统计的暴的来源数

上面是长暴，下面是短暴。 左边是X射线的，右边是u波段的光变曲线。

不同来源的暴的几率分布，可见BAT短暴明显分布于红移低的地方。

1天的时候x射线的光变指数和谱指数的分布

1天的时候光学波段的光变指数和谱指数的分布

不同时间不同来源的长暴的光度分布

对短暴（太少）

长暴和短暴各向同性能量的分布

各个量之间的关联的KS检验，值越小表明两个数据之间的差别越明显

（应该最大值是1，表明量数据完全相同）

暴的张角分布（不确定度很大），以及从而到处的实际光子能量

利用 11小时的时候X射线的光度所导出的动能（依赖于很多参数的方法）

和各向同性能量之间的统计关系

各参数值的范围

初始Lorentz因子的范围，采用了：gamma-gamma,t_peak,

ZP10, 2 zone-gamma gamma这四种方法

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Title:		Fermi and Swift Gamma-Ray Burst Afterglow Population Studies
Authors:		Racusin, J. L.; Oates, S. R.; Schady, P.; Burrows, D. N.; de Pasquale, M.; Donato, D.; Gehrels, N.;Koch, S.; McEnery, J.; Piran, T.; Roming, P.; Sakamoto, T.; Swenson, C.; Troja, E.; Vasileiou, V.;Virgili, F.; Wanderman, D.; Zhang, B.
Publication:		eprint arXiv:1106.2469
Publication Date:		06/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		13 pages, 11 figures, Accepted for publication in ApJ
Bibliographic Code:		2011arXiv1106.2469R

Abstract

The new and extreme population of GRBs detected by Fermi-LAT shows several new features in high energy gamma-rays that are providing interesting and unexpected clues into GRB prompt and afterglow emission mechanisms. Over the last 6 years, it has been Swift that has provided the robust dataset of UV/optical and X-ray afterglow observations that opened many windows into components of GRB emission structure. The relationship between the LAT detected GRBs and the well studied, fainter, less energetic GRBs detected by Swift-BAT is only beginning to be explored by multi-wavelength studies. We explore the large sample of GRBs detected by BAT only, BAT and Fermi-GBM, and GBM and LAT, focusing on these samples separately in order to search for statistically significant differences between the populations, using only those GRBs with measured redshifts in order to physically characterize these objects. We disentangle which differences are instrumental selection effects versus intrinsic properties, in order to better understand the nature of the special characteristics of the LAT bursts.

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