  While large neutrino telescopes have so far mainly focused on the detection
of TeV-PeV astrophysical neutrinos, several efforts are ongoing to extend the
sensitivity down to the GeV level for transient sources. Only a handful of
neutrino searches have been carried out at the moment leaving the signature of
astrophysical transients poorly known in this energy range. In this
contribution, we discuss the motivations for high-energy neutrino telescopes to
explore the GeV energy range and summarize the current limitations of
detectors, such as IceCube and KM3NeT. We then present and compare different
approaches for multi-detector analyses that may enhance the sensitivity to a
transient GeV neutrino flux.
