The Early X-ray Afterglows of Optically Bright and Dark Gamma-Ray Bursts

被引：0

作者：

YiQing Lin Astronomy Department Nanjing University Nanjing ^{[210093
]}

机构：

来源：

ChineseJournalofAstronomyandAstrophysics | 2006年 / 05期

关键词：

gamma rays: bursts;

D O I：

暂无

中图分类号：

P172.3 [γ射线天文学];

学科分类号：

070401 ;

摘要：

<正>A systematic study on the early X-ray afterglows of both optically bright and dark gamma-ray bursts (B-GRBs and D-GRBs) observed by Swift is presented. Our sample includes 25 GRBs of which 13 are B-GRBs and 12 are D-GRBs. Our results show that the distributions of the X-ray afterglow fluxes (Fx), the gamma-ray fluxes (5r), and the ratio (Rr,x.) are similar for the two kinds of GRBs, that any observed differences should be simply statistical fluctuation. These results indicate that the progenitors of the two kinds of GRBs are of the same population with comparable total energies of explosion. The suppression of optical emission in the D-GRBs should result from circumburst but not from their central engine.

引用

页码：555 / 560

页数：6