The origins of the high-energy cosmic neutrino flux remain largely unknown. Recently, one
high-energy neutrino was associated with a tidal disruption event (TDE). Here we present
AT2019fdr, an exceptionally luminous TDE candidate, coincident with another high-energy
neutrino. Our observations, including a bright dust echo and soft late-time x-ray emission,
further support a TDE origin of this flare. The probability of finding two such bright events by
chance is just 0.034%. We evaluate several models for neutrino production and show that …