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Electromagnetic (EM) follow-up observations of gravitational wave (GW) eventswill help shed light on the nature of the sources, and more can be learned ifthe EM follow-ups can start as soon as the GW event becomes observable. In thispaper, we propose a computationally efficient time-domain algorithm capable ofdetecting gravitational waves (GWs) from coalescing binaries of compact objectswith nearly zero time delay. In case when the signal is strong enough, ouralgorithm also has the flexibility to trigger EM observation before the merger.The key to the efficiency of our algorithm arises from the use of chains ofso-called Infinite Impulse Response (IIR) filters, which filter time-seriesdata recursively. Computational cost is further reduced by a templateinterpolation technique that requires filtering to be done only for a muchcoarser template bank than otherwise required to sufficiently recover optimalsignal-to-noise ratio. Towards future detectors with sensitivity extending tolower frequencies, our algorithm's computational cost is shown to increaserather insignificantly compared to the conventional time-domain correlationmethod. Moreover, at latencies of less than hundreds to thousands of seconds,this method is expected to be computationally more efficient than thestraightforward frequency-domain method.

Towards low-latency real-time detection of gravitational waves from compact binary coalescences in the era of advanced detectors