The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon experiment is sensitive to interactions of ultrahigh-energy (E>10¹⁸ eV) neutrinos in the Antarctic ice sheet. The third flight of ANITA, lasting 22 days, began in December 2014. We develop a methodology to search for energetic neutrinos spatially and temporally coincident with potential source classes in ANITA data. This methodology is applied to several source classes: the potential IceCube-identified neutrino sources TXS 0506+056 and NGC 1068, flaring high-energy blazars reported by the Fermi All-Sky Variability Analysis, gamma-ray bursts, and supernovae. Among searches within the five source classes, one candidate was identified as associated with SN 2015D, although not at a statistically significant level. We proceed to place upper limits on the source classes. We further comment on potential application of this methodology to more sensitive future instruments.

南极脉冲瞬态天线（ANITA）长时气球实验对超高能（E>10 ¹⁸eV) 南极冰盖中的中微子。ANITA 的第三次飞行持续 22 天，于 2014 年 12 月开始。我们开发了一种方法来搜索在空间和时间上与 ANITA 数据中的潜在源类别重合的高能中微子。这种方法适用于几个源类别：潜在的 IceCube 识别的中微子源 TXS 0506+056 和 NGC 1068、费米全天变率分析报告的高能耀变体、伽马射线暴和超新星。在五个源类别中的搜索中，一个候选者被确定为与 SN 2015D 相关，尽管在统计上并不显着。我们继续对源类设置上限。我们进一步评论了这种方法在未来更敏感的工具中的潜在应用。