The LIGO/Virgo collaboration published the catalogs GWTC-1, GWTC-2.1 and
GWTC-3 containing candidate gravitational-wave (GW) events detected during its
runs O1, O2 and O3. These GW events can be possible sites of neutrino emission.
In this paper, we present a search for neutrino counterparts of 90 GW
candidates using IceCube DeepCore, the low-energy infill array of the IceCube
Neutrino Observatory. The search is conducted using an unbinned maximum
likelihood method, within a time window of 1000 s and uses the spatial and
timing information from the GW events. The neutrinos used for the search have
energies ranging from a few GeV to several tens of TeV. We do not find any
significant emission of neutrinos, and place upper limits on the flux and the
isotropic-equivalent energy emitted in low-energy neutrinos. We also conduct a
binomial test to search for source populations potentially contributing to
neutrino emission. We report a non-detection of a significant neutrino-source
population with this test.Comment: Submitted to Ap