We discuss observational strategies to detect prompt bursts associated with gravitational wave (GW) events using the Australian Square Kilometre Array Pathfinder (ASKAP). Many theoretical models of binary neutron stars mergers predict that bright, prompt radio emission would accompany the merger. The detection of such prompt emission would greatly improve our knowledge of the physical conditions, environment, and location of the merger. However, searches for prompt emission are complicated by the relatively poor localisation for GW events, with the 90% credible region reaching hundreds or even thousands of square degrees. Operating in fly’s eye mode, the ASKAP field of view can reach $\sim1\,000$ deg $^2$ at $\sim$ $888\,{\rm MHz}$ . This potentially allows observers to cover most of the 90% credible region quickly enough to detect prompt emission. We use skymaps for GW170817 and GW190814 from LIGO/Virgo’s third observing run to simulate the probability of detecting prompt emission for GW events in the upcoming fourth observing run. With only alerts released after merger, we find it difficult to slew the telescope sufficiently quickly as to capture any prompt emission. However, with the addition of alerts released before merger by negative-latency pipelines, we find that it should be possible to search for nearby, bright prompt fast radio burst-like emission from GW events. Nonetheless, the rates are low: we would expect to observe $\sim$ 0.012 events during the fourth observing run, assuming that the prompt emission is emitted microseconds around the merger.

中文翻译：

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澳大利亚平方公里阵列探路者探测中子星合并的即时射电暴的能力

我们讨论了使用澳大利亚平方公里阵列探路者 (ASKAP) 检测与引力波 (GW) 事件相关的即时爆发的观测策略。许多双中子星合并的理论模型预测，合并将伴随着明亮、迅速的无线电发射。检测到这种即时排放将大大提高我们对合并的物理条件、环境和位置的了解。然而，由于 GW 事件的定位相对较差，对瞬时发射的搜索变得复杂，90% 的可信区域达到数百甚至数千平方度。在蝇眼模式下操作，ASKAP 视野可以达到 $\sim1\,000$ 度 $^2$ 在 $\sim$ $888\,{\rm MHz}$ . 这可能使观察者能够以足够快的速度覆盖大部分 90% 的可信区域以检测即时发射。我们使用来自 LIGO/Virgo 的第三次观测运行的 GW170817 和 GW190814 的天空图来模拟在即将到来的第四次观测运行中检测到 GW 事件的即时发射的概率。由于合并后只发布警报，我们发现很难足够快地转动望远镜以捕捉任何即时发射。但是，随着发布的警报的增加前通过负延迟管道合并，我们发现应该可以搜索来自 GW 事件的附近的、明亮的瞬时快速射电暴样发射。尽管如此，利率很低：我们希望观察到 $\sim$ 在第四次观察运行期间发生了 0.012 个事件，假设在合并前后的几微秒内发出了即时发射。