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Pre-merger localization of binary neutron stars (BNSs) is one of the mostimportant scientific goals for the third generation (3G) gravitational wave(GW) detectors. It will enable the electromagnetic observation of the wholeprocess of BNS coalescence, especially for the pre-merger and merger phaseswhich have not been observed yet, opening a window for deeper understandings ofcompact objects. To reach this goal, we describe a novel combination ofmulti-band matched filtering and semi-analytical localization algorithms toachieve early-warning localization of long BNS signals in 3G detectors. Usingour method we are able to efficiently simulate one month of observations with athree-detector 3G network, and show that it is possible to provide accurate skylocalizations more than 30 minutes before the merger. Our simulation shows thatthere could be ~ 10 (~ 100) BNS events localized within 100 deg2, 20 (6)minutes before merger, per month of observation.

Rapid pre-merger localization of binary neutron stars in third generation gravitational wave detectors