IceCube searches for neutrinos accompanying gravitational waves

The IceCube Neutrino Observatory is a neutrino telescope monitoring the entire sky all the time. Models predict that mergers of compact objects, including both those with at least one neutron star and binary black hole mergers, could emit high-energy neutrinos. In the case of binary black hole mergers, this could occur due to the systems residing within the accretion disks of galactic nuclei, which is also a compelling model to explain the high abundance of high-mass binary black hole systems. IceCube has searched for neutrinos accompanying each gravitational wave detected by LIGO/Virgo/KAGRA, archivally since observing run O1 and in real time during observing runs O3 and O4. Detection of a joint gravitational wave – neutrino source would be a major milestone in astrophysics. Moreover, because neutrinos are hundreds of times more precisely localized than gravitational waves, publishing candidate neutrino counterparts in real time can help narrow the search for electromagnetic counterparts. We will summarize results from IceCube searches for neutrinos associated with gravitational waves.