学术通告
2019年度
2018年度
2017年度
2016年度
2015年度
2014年度
2013年度
2012年度
2011年度
2010年度
规章制度
通知公告
·关于停止接待散客参观的公告 (2020-12-29)
·2020年“国家奖学金”获奖名单公示 (2020-10-26)
·中国科学院云南天文台食堂原材料供应商遴选公告 (2020-09-30)
·中国科学院云南天文台关于2020年度岗位聘用事宜的通知 (2020-09-03)
·昆明分院拟提名2020年度云南省科学技术奖励项目相关信息公示 (2020-07-06)
·中国科学院云南天文台2019-2020学年优秀学生初选名单公示 (2020-05-25)
·关于做好2020年度中国科学院院长奖学金初选工作的通知 (2020-05-02)
·关于做好2020年度朱李月华奖学金评选工作的通知 (2020-05-02)
·关于申报2020年度中国科学院大学—必和必拓奖学金的通知 (2020-01-14)
·计算太阳物理领域博士后招聘启事 (2020-01-06)
您现在的位置:首页 > 新闻资讯 > 学术通告 > 2017年度
【云台学术报告】2017年10月25日(周三)下午 3:30-4:30 新行政楼三楼会议室
2017-10-17  |  作者:  |  【  】 【打印】 【关闭

【学术报告】
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
报告题目:GRB 170817A: a peculiar low-luminosity short gamma-ray burst associated with the first NS-NS merger gravitational wave signal

报告人:张彬彬

报告人单位:南京大学

报告时间:2017年10月25日(周三)下午 3:30-4:30

报告地点:新行政楼三楼会议室

报告语言:中文

报告摘要: 

  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   Short-duration gamma-ray bursts (sGRBs) have long been proposed to be produced in systems involving the coalescence of double neutron stars (NS-NS), and the observations of sGRB afterglows and host galaxies are consistent with such a conjecture. Based on the estimated event rate density derived from previously observed sGRBs at cosmological distances, the chance of detecting a sGRB within a small volume for detectable NS-NS mergers by advanced LIGO is very low. On August 17, 2017, coinciding with a double neutron star merger gravitational wave event detected by the LIGO-Virgo gravitational wave detector network, a short-duration GRB 170817A was detected by both Gamma-Ray Monitor (GBM) on board NASA's Fermi Gamma-Ray Observatory and INTEGRAL. Here we show that the fluence (~4.46×10?7 erg cm?2) and spectral peak energy (~158 keV) of this sGRB fall into the lower portion of the distributions of known sGRBs. With a very small distance from Earth, its peak isotropic luminosity (~1.7e47 erg s^?1) is abnormally low. With its detection, the estimated event rate density above this luminosity is at least 190(+440?160)Gpc^?3 yr^?1, which is close to but still below the NS-NS merger event rate density. The low-luminosity sGRB may originate from a structured jet viewed from a large viewing angle. Alternatively, not all NS-NS mergers produce energetic jets. There are similar faint soft GRBs in the Fermi GBM archival data, a small fraction of which might belong to this new population of nearby, low-luminosity sGRBs.

 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

本通知也可以在云台学术报告网页看到:

http://www.ynao.cas.cn/xwzx/xstg/

申请安排学术报告的同事请参见台学术报告管理办法:

http://www.ynao.cas.cn/xwzx/xstg/gzzd/

2.4米望远镜组

云南天文台学术委员会

邀请人:赵晓红 联系电话: 15096610585

10月23日

 
©2010  中科院云南天文台    版权所有     滇ICP备05000010号-1    滇公网安备53011102001009号
地址:中国 云南省 昆明市 官渡区 羊方旺396号    邮编:650216    联系我们