Searching for sub-TeV neutrino counterparts with IceCube for sub-threshold Gravitational Wave events

The IceCube Neutrino Observatory, located in the Antarctica, has been actively participating in multi-messenger follow-up of Gravitational Wave events since the first observation run of the LIGO-Virgo collaboration. LIGO-Virgo now also provides sub-threshold gravitational wave (GW) candidate information publicly, since the release of the Gravitational Wave Transient Catalog GWTC-2.1. Using these sub-threshold GW candidates for multi-messenger studies complements the ongoing efforts to identify neutrino counterparts to GW events. Here, we present the current status of the ongoing archival studies with the sub-TeV neutrinos detected by the dense-infill array of IceCube, known as DeepCore. We have performed a selection of the sub-threshold GW candidates from GWTC-2.1 and GWTC-3. Neutrino counterparts are looked for using Unbinned Maximum Likelihood method. We report the 90% C.L. sensitivities and the 3σ discovery potential of this sub-TeV neutrino dataset for each selected sub-threshold GW candidate, considering spatial and temporal correlation between the GW and neutrino events within a 1000 s time window.