  Tensions between the diffuse gamma-ray sky observed by the Fermi Large Area
Telescope (LAT) and the diffuse high-energy neutrino sky detected by the
IceCube South Pole Neutrino Observatory question our knowledge about
high-energy neutrino sources in the gamma-ray regime. While blazars are among
the most energetic persistent particle accelerators in the Universe, studies
suggest that they could account for up to for 10-30% of the neutrino flux
measured by IceCube. Our recent results highlighted that the associated IceCube
neutrinos arrived in a local gamma-ray minimum (dip) of three strong neutrino
point-source candidates. We increase the sample of neutrino-source candidates
to study their gamma-ray light curves. We generate the one-year Fermi-LAT light
curve for 8 neutrino source candidate blazars (RBS 0958, GB6 J1040+0617, PKS
1313-333, TXS 0506+056, PKS 1454-354, NVSS J042025-374443, PKS 0426-380 and PKS
1502+106), centered on the detection time of the associated IceCube neutrinos.
We apply the Bayesian block algorithm on the light curves to characterize their
variability. Our results indicate that GB6 J1040+0617 was in the phase of high
gamma-ray activity, while none of the other 7 neutrino source candidates were
statistically bright during the detection of the corresponding neutrinos and
that indeed even most of the times neutrinos arrived in a faint gamma-ray phase
of the light curves. This suggests that the 8 source-candidate blazars
(associated with 7 neutrino events) in our reduced sample are either not the
sources of the corresponding IceCube neutrinos, or that an in-source effect
(e.g. suppression of gamma rays due to high gamma-gamma opacity) complicates
the multimessenger scenario of neutrino emission for these blazars.
