PMO OpenIR
Short GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW Association
Jin, Zhi-Ping1,2; Li, Xiang1; Wang, Hao1,2; Wang, Yuan-Zhu1,2; He, Hao-Ning1; Yuan, Qiang1,2; Zhang, Fu-Wen3; Zou, Yuan-Chuan4; Fan, Yi-Zhong1,2; Wei, Da-Ming1,2
2018-04-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume857Issue:2Pages:10
Abstract

The jet breaks in the afterglow light curves of short gamma-ray bursts (SGRBs), rarely detected so far, are crucial for estimating the half-opening angles of the ejecta (theta(j)) and hence the neutron star merger rate. In this work, we report the detection of jet decline behaviors in GRB 150424A and GRB 160821B, and find theta j similar to 0.1 rad. Together with five events reported before 2015 and three others "identified" recently (GRB 050709, GRB 060614, and GRB 140903A), we have a sample consisting of nine SGRBs and one long-short GRB with reasonably estimated theta(j). In particular, three Swift bursts in the sample have redshifts z <= 0.2, with which we estimate the local neutron star merger rate density to be similar to 1109(-657)(+1432) Gpc(-3) yr(-1) or 162(-83)(+140) Gpc(-3) yr(-1) if the narrowly beamed GRB 061201 is excluded. Inspired by the typical theta(j) similar to 0.1 rad found currently, we further investigate whether the off-beam GRBs (in the uniform jet model) or the off-axis events (in the structured jet model) can significantly enhance the GRB/GW association. For the former, the enhancement is at most moderate, while for the latter the enhancement can be much greater and a high GRB/GW association probability of similar to 10% is possible. We also show that the data of GRB 160821B may contain a macronova/kilonova emission component with a temperature of similar to 3100 K at similar to 3.6 days after the burst and more data are needed to ultimately clarify.

Keywordbinaries: close gamma-ray burst: individual (GRB 150424A, GRB 160821B) gravitational waves
DOI10.3847/1538-4357/aab76d
WOS KeywordGAMMA-RAY BURSTS ; AFTERGLOW LIGHT CURVES ; STANDARD ENERGY RESERVOIR ; COMPACT OBJECT MERGERS ; ELECTROMAGNETIC COUNTERPARTS ; JETS ; EMISSION ; NUCLEOSYNTHESIS ; IDENTIFICATION ; GRB-051221A
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000430827000011
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24085
Collection中国科学院紫金山天文台
Corresponding AuthorJin, Zhi-Ping
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Guilin Univ Technol, Coll Sci, Guilin 541004, Peoples R China
4.Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Jin, Zhi-Ping,Li, Xiang,Wang, Hao,et al. Short GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW Association[J]. ASTROPHYSICAL JOURNAL,2018,857(2):10.
APA Jin, Zhi-Ping.,Li, Xiang.,Wang, Hao.,Wang, Yuan-Zhu.,He, Hao-Ning.,...&Wei, Da-Ming.(2018).Short GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW Association.ASTROPHYSICAL JOURNAL,857(2),10.
MLA Jin, Zhi-Ping,et al."Short GRBs: Opening Angles, Local Neutron Star Merger Rate, and Off-axis Events for GRB/GW Association".ASTROPHYSICAL JOURNAL 857.2(2018):10.
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