Presented is the description of a new and general method used to search for $\gamma$-ray counterparts to gravitational-wave (GW) triggers. This method is specifically applied to single GW detector triggers. Advanced LIGO data from observing runs O1 and O2 were analyzed, thus each GW trigger comes from either the LIGO-Livingston or the LIGO-Hanford interferometer. For each GW trigger, Fermi Gamma-ray Burst Monitor data is searched and the most significant subthreshold signal counterpart is selected. Then, a methodology is defined in order to establish which of GW-$\gamma$-ray pairs are likely to have a common origin. For that purpose an association ranking statistic is calculated from which a false alarm rate is derived. The events with the highest ranking statistics are selected for further analysis consisting of LIGO detector characterization and parameter estimation. The $\gamma$-ray signal characteristics are also evaluated. We find no significant candidates from the search.

中文翻译：

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在 Fermi-GBM 中寻找与伽马射线事件同时发生的高级 LIGO 单干涉仪紧凑二元聚结信号

介绍了一种新的通用方法，用于搜索引力波 (GW) 触发器的 $\gamma$ 射线对应物。该方法特别适用于单GW探测器触发。分析了来自观测运行 O1 和 O2 的高级 LIGO 数据，因此每个 GW 触发来自 LIGO-Livingston 或 LIGO-Hanford 干涉仪。对于每个 GW 触发器，搜索费米伽玛射线突发监视器数据并选择最重要的亚阈值信号对应物。然后，定义了一种方法来确定哪些 GW-$\gamma$-射线对可能具有共同的起源。为此目的，计算关联排名统计，从中导出误报率。选择具有最高排名统计数据的事件进行进一步分析，包括 LIGO 探测器表征和参数估计。还评估了 $\gamma$ 射线信号特性。我们没有从搜索中找到重要的候选者。