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With its wide and deep field of view, the LSST is expected to uncover a population of kilonovae (KNe), the optical transient associated with binary neutron star mergers (BNS). To date, AT 2017gfo is the only confirmed kilonova detection. Kilonovae are faint and rapidly decaying transients, making GW triggers an essential tool for kilonova searches. However, we expect a number of serendipitous kilonova observations from the main LSST survey. These discoveries could be associated with sub-threshold or single detector GW events. Recovering the merger time of the associated binary neutron star merger from these observations would maximise the prospects for multi-messenger astronomy involving serendipitous kilonova detections.

We perform a full parameter estimation on simulated kilonova light curves with observations starting >1day post-merger, focusing on constraints on the merger time. We compare the effectiveness of observations in different pairs of bands and at different cadences on the recovery of the merger time.