Relation between the hardness ratio and time in the first two seconds for compatible samples of short and long gamma-ray bursts

	Relation between the hardness ratio and time in the first two seconds for compatible samples of short and long gamma-ray bursts
	Tan YP(覃一平)1,3 ; Dong YM(董云明)1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2005-04-21
卷号	358 期号:4 页码:1320-1324
关键词	methods : statistical gamma-rays : bursts
ISSN号	0035-8711
通讯作者	Qin, YP (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	In this paper, we randomly selected a sample ( sample 1) of long gamma-ray bursts, with its size being the same as that of the short-burst group ( sample 2) ( N = 500), from the Current BATSE Bursts Catalog. We randomly selected a short burst and assigned its T-90 to each of these long bursts. We thus constructed a long-burst sample with both the sample size and the distribution of T-90 being the same as those of the short-burst sample obtained from the Current BATSE Bursts Catalog. Then we calculated the hardness ratio (hr(t)) over the assigned T-90 for the long bursts and over their own T90 for the short bursts, and studied the relation between the hardness ratio and the corresponding T90 for these two samples. We also calculated the hardness ratio ( hrt) over the randomly selected 64-ms time intervals within the T-90, and investigated the relation between this hardness ratio and the selected 64-ms time interval. In addition, the hr(T) within and beyond the first two seconds for all the long bursts ( sample 3; N = 1541) were also investigated. We found that the Kolmogorov - Smirnov (KS) probabilities of the distributions of hr(T) (7.15337E- 15) and hr(t) (9.54833E- 10) for samples 1 and 2 are very small, and the average values of hrT and hrt for short bursts are obviously larger than those of the long bursts. The correlations between log hr(T) and log T-90, and between log hrt and log t, are different for samples 1 and 2. These show that short and long bursts in the first two seconds have different characters and they probably originate from different progenitors. For sample 3, for the two time intervals, the KS probability is 5.35828E-5, which suggests that the hardness ratios in different time intervals for long bursts are also different.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	35462
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/358/4/1320
语种	英语
WOS记录号	WOS:000228179000015
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6993]
专题	云南天文台_星系研究组
作者单位	1.National Astronomical Observatories,Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China 2.Graduate School of The Chinese Academy of Sciences, Beijing 100039, China 3.Physics Department, Guangxi University, Nanning, Guangxi 530004, China
推荐引用方式 GB/T 7714	Tan YP,Dong YM. Relation between the hardness ratio and time in the first two seconds for compatible samples of short and long gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2005,358(4):1320-1324.
APA	Tan YP,&Dong YM.(2005).Relation between the hardness ratio and time in the first two seconds for compatible samples of short and long gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,358(4),1320-1324.
MLA	Tan YP,et al."Relation between the hardness ratio and time in the first two seconds for compatible samples of short and long gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 358.4(2005):1320-1324.