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arXiv 2103.05209astro-ph.HE
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用澳大利亚望远镜紧凑阵列对短GRB 181123 B的快速响应射电观测

Rapid-response radio observations of short GRB 181123B with the Australia Telescope Compact Array

G. E. Anderson, M. E. Bell, J. Stevens, M. D. Aksulu, J. C. A. Miller-Jones, A. J. van der Horst, R. A. M . J. Wijers, A. Rowlinson, A. Bahramian, P. J. Hancock… 展开作者

G. E. Anderson, M. E. Bell, J. Stevens, M. D. Aksulu, J. C. A. Miller-Jones, A. J. van der Horst, R. A. M . J. Wijers, A. Rowlinson, A. Bahramian, P. J. Hancock, J. -P. Macquart, S. D. Ryder, R. M. Plotkin

摘要:

介绍了澳大利亚望远镜紧凑阵列(ATCA)的快速响应模式,并介绍了短持续时间伽马射线暴(GRB)181123 B的首次成功触发。对短GRB的早期射电观测可能会为高级LIGO和Virgo探测到的引力波事件的射电余辉特性提供重要的见解,这反过来又会为后续策略提供信息,以在其大的位置不确定性范围内寻找对应物。ATCA在爆炸后12.6小时内达到目标,当时震源已经升到地平线以上。虽然在8.3小时的观测过程中没有检测到无线电余辉,但我们分别在5.5和9 GHz获得了$7 \pm 12$和$15 \pm 11~μ$ Jy的强迫拟合通量密度。GRB 181123 B的余辉建模表明,在雨燕X射线望远镜的探测中加入ATCA力拟合的射电通量密度,对电子中热能的比例提供了更严格的约束(log $ε_e = -0.75^{+0.39}_{-0.40}$而不是log $ε_e = -1.13^{+0.82}_{-1.2}$,而不包括ATCA值),这与从GRB余辉建模中得出的典型$ε_e$的范围是一致的。这使我们能够预测,前向冲击波可能已经达到峰值的无线电波段$\sim10$天后爆发,产生可检测的无线电发射$\gtrsim3-4$天后爆发。总体而言,我们证明了非常快速的无线电后续瞬态和触发的无线电观测约束伽玛射线暴冲击波属性的重要性,无论是否有检测,通过列入强制拟合的无线电通量密度余辉建模工作的潜力。

英文摘要:

We introduce the Australia Telescope Compact Array (ATCA) rapid-response mode by presenting the first successful trigger on the short-duration gamma-ray burst (GRB) 181123B. Early-time radio observations of short GRBs may provide vital insights into the radio afterglow properties of Advanced LIGO- and Virgo-detected gravitational wave events, which will in turn inform follow-up strategies to search for counterparts within their large positional uncertainties. The ATCA was on target within 12.6 hr post-burst, when the source had risen above the horizon. While no radio afterglow was detected during the 8.3 hr observation, we obtained force-fitted flux densities of $7 \pm 12$ and $15 \pm 11~μ$Jy at 5.5 and 9 GHz, respectively. Afterglow modelling of GRB 181123B showed that the addition of the ATCA force-fitted radio flux densities to the Swift X-ray Telescope detections provided more stringent constraints on the fraction of thermal energy in the electrons (log$ε_e = -0.75^{+0.39}_{-0.40}$ rather than log$ε_e = -1.13^{+0.82}_{-1.2}$ derived without the inclusion of the ATCA values), which is consistent with the range of typical $ε_e$ derived from GRB afterglow modelling. This allowed us to predict that the forward shock may have peaked in the radio band $\sim10$ days post-burst, producing detectable radio emission $\gtrsim3-4$ days post-burst. Overall, we demonstrate the potential for extremely rapid radio follow-up of transients and the importance of triggered radio observations for constraining GRB blast wave properties, regardless of whether there is a detection, via the inclusion of force-fitted radio flux densities in afterglow modelling efforts.

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