Searching for Sub-threshold Gravitational Wave Candidates with RAVEN

RAVEN, the Rapid on-source VOEvent Coincidence Monitor, is a low-latency pipeline searching for coincidences between gravitational wave candidates and astrophysical alerts external to the LIGO-Virgo-KAGRA collaboration, including gamma-ray and neutrino bursts. RAVEN calculates a joint false alarm rate using timing and spatial information from coincident events with the goal of increasing the significance of sub-threshold binary neutron star, neutron star-black hole, and unmodelled gravitational wave candidates for public release. RAVEN will help in increasing the population of joint observations and improve the chances of subsequent EM observations, especially if joint EM-GW sky-maps are more constrained and more accurate.