First demonstration of early warning gravitational wave alerts
Ryan Magee, Deep Chatterjee, Leo P. Singer, Surabhi Sachdev, Manoj, Kovalam, Geoffrey Mo, Stuart Anderson, Patrick Brady, Patrick Brockill, Kipp, Cannon, Tito Dal Canton, Qi Chu, Patrick Clearwater, Alex Codoreanu, Marco, Drago, Patrick Godwin, Shaon Ghosh, Giuseppe Greco

TL;DR
This paper reports the development and testing of an early-warning system for gravitational wave alerts from binary neutron star mergers, enabling pre-merger alerts to facilitate rapid multi-messenger follow-up observations.
Contribution
It introduces a low-latency infrastructure within LIGO-Virgo for pre-merger gravitational wave alerts, demonstrated through mock data challenges.
Findings
Successful detection of binary neutron star mergers before merger in simulations
Low-latency alert system capable of real-time operation
Enhanced readiness for multi-messenger astrophysics
Abstract
Gravitational-wave observations became commonplace in Advanced LIGO-Virgo's recently concluded third observing run. 56 non-retracted candidates were identified and publicly announced in near real time. Gravitational waves from binary neutron star mergers, however, remain of special interest since they can be precursors to high-energy astrophysical phenomena like -ray bursts and kilonovae. While late-time electromagnetic emissions provide important information about the astrophysical processes within, the prompt emission along with gravitational waves uniquely reveals the extreme matter and gravity during - and in the seconds following - merger. Rapid communication of source location and properties from the gravitational-wave data is crucial to facilitate multi-messenger follow-up of such sources. This is especially enabled if the partner facilities are forewarned via an…
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