An early warning system for electromagnetic follow-up of gravitational-wave events

Abstract

Binary neutron stars (BNSs) will spend $\simeq 10$ -- 15 minutes in the band of Advanced LIGO and Virgo detectors at design sensitivity. Matched-filtering of gravitational-wave (GW) data could in principle accumulate enough signal-to-noise ratio (SNR) to identify a forthcoming event tens of seconds before the companions collide and merge. Here we report on the design and testing of an early warning gravitational-wave detection pipeline. Early warning alerts can be produced for sources that are at low enough redshift so that a large enough SNR accumulates $\sim 10-60\mathrm{s}$ before merger. We find that about 7% (respectively, 49%) of the total detectable BNS mergers will be detected $60\mathrm{s}$ ($10\mathrm{s}$) before the merger. About 2% of the total detectable BNS mergers will be detected before merger and localized to within $100{\text{deg}}^2$ (90% credible interval). Coordinated observing by several wide-field telescopes could capture the event seconds before or after the merger. LIGO-Virgo detectors at design sensitivity could facilitate observing at least one event at the onset of merger.

arXiv commentsmall update in numbers caused by using a more updated local BNS rate estimate

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