Based on the originally communicated locations of the GW signal and the GRB detection , high - energy neutrino candidates were initially searched for in the ANTARES online data stream , relying on a fast algorithm which selects only up - going neutrino track candidates ( Adrián - Martínez et al . 2016b ) . No up - going muon neutrino candidate events were found in a ±500 s time window centered on the GW event time -for an expected number of atmospheric background events of ∼ 10 −2 during the coincident time window . An extended online search during ±1 h also resulted in no up - going neutrino coincidences .