  In this work we study gravitational lensing of neutrinos by Schwarzschild
black holes. In particular, we analyze the case of a neutrino transient source
associated with a gamma-ray burst lensed by a supermassive black hole located
at the center of an interposed galaxy. We show that the primary and secondary
images have an angular separation beyond the resolution of forthcoming km-scale
detectors, but the signals from each image have time delays between them that
in most cases are longer than the typical duration of the intrinsic events. In
this way, the signal from different images can be detected as separate events
coming from the very same location in the sky. This would render an event that
otherwise might have had a low signal-to-noise ratio a clear detection, since
the probability of a repetition of a signal from the same direction is
negligible. The relativistic images are so faint and proximate that are beyond
the sensitivity and resolution of the next-generation instruments.

Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Phenomenology