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The Advanced LIGO and Virgo gravitational wave observatories have opened anew window with which to study the inspiral and mergers of binary compactobjects. These observations are most powerful when coordinated withmulti-messenger observations. This was underlined by the first observation of abinary neutron star merger GW170817, coincident with a short Gamma-ray burst,GRB170817A, and the identification of the host galaxy NGC~4993 from the opticalcounterpart AT~2017gfo. Finding the fast-fading optical counterpart criticallydepends on the rapid production of a sky-map based on LIGO/Virgo data.Currently, a rapid initial sky map is produced followed by a more accurate,high-latency, $\gtrsim{12}{\rm{hr}}$ sky map. We study optimization choices ofthe Bayesian prior and signal model which can be used alongside otherapproaches such as reduced order quadrature. We find these yield up to a $60\%$reduction in the time required to produce the high-latency localisation forbinary neutron star mergers.

Optimized localization for gravitational-waves from merging binaries