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arXiv 1406.1850astro-ph.HEastro-ph.CO
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寻找与伽马射线暴有关的快速射电暴

A Search for Fast Radio Bursts Associated with Gamma-Ray Bursts

Divya Palaniswamy, Randall B. Wayth, Cathryn M. Trott, Jamie N. McCallum, Steven J. Tingay, Cormac Reynolds

摘要:

最近报道了对六个快速射电暴(FRB)的探测。FRB是来自天文源的短持续时间($\sim$ 1 ms)、高度分散的无线电脉冲。FRB的物理解释仍然不清楚,但被认为涉及宇宙学距离上的高度紧凑的物体。有人认为,一小部分FRB可能与伽马射线暴(GRB)有物理联系。最近的伽玛暴射电观测报告,使用12米射电望远镜在1.4 GHz的两个高度分散的短持续时间的无线电脉冲的检测。基于这一结果,我们对与伽玛暴相关的FRB进行了系统而敏感的搜索。我们用霍巴特芒特普莱森特射电天文台的26米射电望远镜观测了5个2.3 GHz的伽玛暴。射电望远镜是自动化的,可以快速响应来自雨燕卫星的伽马射线协调网络通知,并在$\sim$ 140秒内转换到伽马射线暴位置。数据中搜索的脉冲高达5000 pc $\rm cm^{-3}$的分散措施和脉冲宽度范围从640 $\rm μ$ s到25.60 ms。我们没有检测到任何事件$\rm \geq 6 σ$。对我们的数据进行深入的统计分析表明,在$\rm 5 σ$以上检测到的事件仅与热噪声波动一致。我们的数据与以前的实验的联合分析表明,以前声称的从伽玛暴中检测到FRB不太可能是天体物理的。我们的研究结果与最近提出的FRB事件率和GRB事件率之间缺乏一致性一致。

英文摘要:

The detection of six Fast Radio Bursts (FRBs) has recently been reported. FRBs are short duration ($\sim$ 1 ms), highly dispersed radio pulses from astronomical sources. The physical interpretation for the FRBs remains unclear but is thought to involve highly compact objects at cosmological distance. It has been suggested that a fraction of FRBs could be physically associated with gamma-ray bursts (GRBs). Recent radio observations of GRBs have reported the detection of two highly dispersed short duration radio pulses using a 12 m radio telescope at 1.4 GHz. Motivated by this result, we have performed a systematic and sensitive search for FRBs associated with GRBs. We have observed five GRBs at 2.3 GHz using a 26 m radio telescope located at the Mount Pleasant Radio Observatory, Hobart. The radio telescope was automated to rapidly respond to Gamma-ray Coordination Network notifications from the Swift satellite and slew to the GRB position within $\sim$ 140 s. The data were searched for pulses up to 5000 pc $\rm cm^{-3}$ in dispersion measure and pulse widths ranging from 640 $\rm μ$s to 25.60 ms. We did not detect any events $\rm \geq 6 σ$. An in-depth statistical analysis of our data shows that events detected above $\rm 5 σ$ are consistent with thermal noise fluctuations only. A joint analysis of our data with previous experiments shows that previously claimed detections of FRBs from GRBs are unlikely to be astrophysical. Our results are in line with the lack of consistency noted between the recently presented FRB event rates and GRB event rates.

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