A search for ultrahigh-energy neutrinos associated with astrophysical sources using the third flight of ANITA

Abstract The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon experiment is sensitive to interactions of ultrahigh-energy (E>10 18 eV) neutrinos in the Antarctic ice sheet. third flight ANITA, lasting 22 days, began December 2014. We develop a methodology search for energetic spatially and temporally coincident with potential source classes ANITA data. This applied several classes: IceCube-identified neutrino sources TXS 0506+056 NGC 1068, flaring high-energy blazars reported by Fermi All-Sky Variability Analysis, gamma-ray bursts, supernovae. Among searches within five classes, one candidate was identified as associated SN 2015D, although not at statistically significant level. proceed place upper limits on classes. further comment application this more future instruments.