Sub-threshold binary neutron star search in Advanced LIGO's first observing run

We present a search for gravitational waves from binary neutron stars in Advanced LIGOs first observing run using data publicly available via the Gravitational Wave Open Science Center (GWOSC). We consider a narrow range of binary chirp masses motivated by the population of known double neutron star binaries in the local universe. The analysis includes times when only one of the two LIGO interferometers was in operation; this is the first search to assign significances to candidates found in single detector time. No individually unambiguous gravitational wave candidates were identified in our sample of 103 sub-threshold candidates with false-alarm-rates of less than one per day. From the expected binary neutron star merger rate, we infer that O(1) of these sub-threshold candidates is in fact a binary neutron star merger. It could be possible to correlate these candidates with other astrophysical messengers to identify a potential multi-messenger signal. We provide an online catalog of the times and sky locations for each sub-threshold candidate to enable multi-messenger follow up.