  In addition to its implications for astrophysics, the hunt for GRB neutrinos
could also be significant in quantum-gravity research, since they are excellent
probes of the microscopic fabric of spacetime. Some previous studies based on
IceCube neutrinos had found intriguing preliminary evidence that some of them
might be GRB neutrinos with travel times affected by quantum properties of
spacetime, with the noticeable feature that quantum spacetime would slow down
some of the neutrinos while others would be sped up. Recently the IceCube
collaboration revised significantly the estimates of the direction of
observation of their neutrinos, and we here investigate how the corrected
directional information affects the results of the previous
quantum-spacetime-inspired analyses. We find that there is now no evidence for
neutrinos sped up by quantum-spacetime properties, whereas the evidence for
neutrinos slowed down by quantum spacetime is even stronger than previously
found. Our most conservative estimates find a false alarm probability of less
than 1% for these "slow neutrinos", providing motivation for future studies on
larger data samples.
