Combined search of MeV ν and gravitational waves from astrophysical impulsive sources

The search of astrophysical impulsive sources emitting low-energy neutrinos and Gravitational Waves (GWs) can be challenging for different reasons: weak signals at the source, large distance of the source, high background inside the detectors. A joint search in a network of GWs and $\nu$ detectors can provide several benefits: temporal coincidences of GWs and MeV $\nu$ bursts improve sensitivity and confidence of detection and a correlation studies of the two probes provide complementary informations on the physical mechanisms at work inside the source. In this paper we summarise the strategy for such a combined search defined during the last years. Moreover, we apply, for the first time in this context, a novel method that increases the probability of identifying impulsive astrophysical bursts of low-energy neutrinos. The proposed approach exploits the temporal structure differences between astrophysical bursts and background fluctuations and it allows us to pinpoint weak signals otherwise unlikely to be detected.