  IceCube has reported evidence for neutrino emission from the Seyfert-II
galaxy NGC 1068 and the blazar TXS 0506+056. The former was identified in a
time-integrated search, and the latter using time-dependent and multi-messenger
methods. A natural question is: are sources identified in time-integrated
searches consistent with a steady neutrino source? We present a non-parametric
method, TAUNTON, to answer this question. Motivated by the Cram\'er-von Mises
test, TAUNTON is an unbinned single-hypothesis method to identify deviations in
neutrino data from the steady hypothesis. An advantage of TAUNTON is that it is
sensitive to arbitrary deviations from the steady hypothesis. Here we present
results of TAUNTON applied to a 8.7 year data-set of muon neutrino track
events; the same data used to identify NGC 1068 at 4.2$\sigma$. We use TAUNTON
on 51 objects, a subset (with >4 signal neutrinos) of the 110 objects studied
in the NGC 1068 publication. We set a threshold of 3$\sigma$ pre-trial to
identify sources inconsistent with the steady hypothesis. TAUNTON reports a
p-value of 0.9 for NGC 1068, consistent with the steady hypothesis. Using the
time integrated fit, data for TXS 0506+056 is consistent with the steady
hypothesis at 1.7$\sigma$. Time variability is not identified for TXS 0506+056
because there are few neutrino events.

High Energy Astrophysical Phenomena