Search for Radio Remnants of Nearby Off-axis Gamma-Ray Bursts in a Sample of Swift/BAT Events
Search for Radio Remnants of Nearby Off-axis Gamma-Ray Bursts in a Sample of Swift/BAT Events
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DOI：
10.3847/1538-4357/abd315
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发表时间：
2020-08
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通讯作者：
C. Grandorf;J. McCarty;P. Rajkumar;H. Harbin;K. H. Lee;A. Corsi;I. Bartos;Z. Márka;A. Balasubramanian;S. Márka
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作者：
C. Grandorf;J. McCarty;P. Rajkumar;H. Harbin;K. H. Lee;A. Corsi;I. Bartos;Z. Márka;A. Balasubramanian;S. Márka
引力波（GW）和来自双星中子星星（NS）合并GW 170817的光的多信使发现，与伽马射线暴（GRB）170817 A和kilonova AT 2017 gfo相关，标志着天体物理学新时代的开始。GW 170817已经证实，双星NS合并是至少一些短伽玛暴的祖先。GRB 170817 A射电余辉的特殊性质，其特征是与离轴几何形状有关的延迟开始，也表明了一些附近的短GRB可能无法用标准的短时间尺度电磁跟踪观测来识别。在此新信息的基础上，我们进行了晚时间的射电观测的样本的四个短GRB与未知的红移和没有以前检测到余辉的雨燕/BAT样本，以确定附近（百万秒差距）离轴GRB候选人通过其潜在的晚时间的无线电签名。我们发现一个以前未编目的射电源的误差区域内的GRB 130626与流量密度一致的NS无线电耀斑在一个距离为100兆秒差距。与GRB无关的持续性射电源相关的起源不能被排除，也不能被确认，因为在这里考虑的误差区域中假阳性的可能性很高，并且我们的观测时间基线有限。需要进一步的无线电（和X射线）跟踪观察，以更好地了解这个来源的起源。
The multi-messenger discovery of gravitational waves (GWs) and light from the binary neutron star (NS) merger GW170817, associated with gamma-ray burst (GRB) 170817A and kilonova AT2017gfo, has marked the start of a new era in astrophysics. GW170817 has confirmed that binary NS mergers are progenitors of at least some short GRBs. The peculiar properties of the GRB 170817A radio afterglow, characterized by a delayed onset related to the off-axis geometry, have also demonstrated how some nearby short GRBs may not be identified as such with standard short-timescale electromagnetic follow-up observations. Building upon this new information, we performed late-time radio observations of a sample of four short GRBs with unknown redshift and no previously detected afterglow in the Swift/BAT sample in order to identify nearby ( Mpc) off-axis GRB candidates via their potential late-time radio signatures. We find a previously uncatalogued radio source within the error region of GRB 130626 with a flux density consistent with an NS radio flare at a distance of ∼100 Mpc. An origin related to a persistent radio source unrelated to the GRB cannot be excluded nor confirmed given the high chance of false positives in error regions as large as those considered here, and the limited time baseline of our observations. Further radio (and X-ray) follow-up observations are needed to better understand the origin of this source.