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The recent discovery of electromagnetic signals in coincidence withgravitational waves from neutron-star mergers has solidified the importance ofmultimessenger campaigns for studying the most energetic astrophysical events.Pioneering multimessenger observatories, such as the LIGO/Virgo gravitationalwave detectors and the IceCube neutrino observatory, record many candidatesignals that fall short of the detection significance threshold. Thesesub-threshold event candidates are promising targets for multimessengerstudies, as the information provided by these candidates may, when combinedwith time-coincident gamma-ray observations, lead to significant detections. Inthis contribution, I describe our use of sub-threshold binary neutron starmerger candidates identified in Advanced LIGO's first observing run (O1) tosearch for transient events in very-high-energy gamma rays using archivalobservations from the VERITAS imaging atmospheric Cherenkov telescope array. Idescribe the promise of this technique for future joint sub-threshold searches.

An Archival Search for Very-High-Energy Counterparts to Sub-Threshold Neutron-Star Merger Candidates