Detection, sky localization and early warning for binary neutron star mergers by detectors located in China of different configurations in third generation detector network

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This work shows the results of an evaluation of the impact that a detector located in China, with a noise budget comparable to that of a proposed high-frequency detector with a 20 km arm length, an Einstein Telescope (ET) or a Cosmic Explorer (CE), could have on the network of ET-CE in terms of detection rate, localization, and providing early warning alert for simulated binary neutron star (BNS)s.

• The results indicate that a three-detector network including a Chinese detector could identify at least 4.4% more BNS mergers than an ET-CE network alone.
• The localization uncertainty could be reduced by a factor of more than 5 on average compared to the ET-CE network.
• With a three-detector network involving a Chinese detector, up to 89% of BNS mergers could be located within 10 square degrees of the sky 10 minutes prior to the merger.