Radio forensics could unmask nearby off-axis gamma-ray bursts
Radio forensics could unmask nearby off-axis gamma-ray bursts
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DOI：
10.1093/mnras/stz719
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发表时间：
2018-11
影响因子：
4.8
通讯作者：
I. Bartos;K. Lee;A. Corsi;Z. Márka;S. Márka
中科院分区：
文献类型：
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作者：
I. Bartos;K. Lee;A. Corsi;Z. Márka;S. Márka
对中子星并合双星GW 170817的γ射线暴（GRB）170817 A的多信使观测表明，在与γ射线暴喷流轴成较大角度时，可以观测到低能γ射线辐射。如果这种结构性发射是典型的，那么目前已知的没有距离测量的短伽玛暴样本可能包含多个附近的离轴事件，其延迟的余辉可能没有被检测到。这些附近的中子星星合并可能会产生泄漏的无线电耀斑，在伽马射线暴发射后几年达到峰值，仍然可以观察到。在这里，我们表明，几个短伽玛暴观测到的尼尔Gehrels \textit{斯威夫特}卫星上的爆发警报望远镜（BAT），没有确定的余辉和距离测量，可能与无线电耀斑检测敏感厘米波长的无线电设施，如卡尔G。Jansky甚大阵。我们还研究了光学后续观测已经进行了这些事件，并发现附近的GW 170817一样kilonova被排除只有三分之一。
The multi-messenger observation of gamma-ray burst (GRB)\,170817A from the nearby binary neutron-star merger GW170817 demonstrated that low-energy $\gamma$-ray emission can be observed at relatively large angles from GRB jet axes. If such structured emission is typical, then the currently known sample of short GRBs with no distance measurements may contain multiple nearby off-axis events whose delayed afterglows could have gone undetected. These nearby neutron star mergers may produce telltale radio flares peaking years after the prompt GRB emission that could still be observable. Here, we show that several short GRBs observed by the Burst Alert Telescope (BAT) on the Neil Gehrels \textit{Swift} satellite, with no identified afterglow and no distance measurement, could potentially be associated with radio flares detectable by sensitive cm-wavelength radio facilities such as the Karl G. Jansky Very Large Array. We also examine optical follow-up observations that have been carried out for these events, and find that a nearby GW170817-like kilonova is ruled out for only a third of them.