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Gravitational wave echo signals have been proposed as evidence for themodification of the spacetime structure near the classical event horizon. Thesesignals are expected to occur after the mergers of compact binaries as asequence of weak pulse-like signals. Some studies have shown evidence of theecho signals from several binary black hole merger events. On the other hand,the other studies have shown the low significance of such signals from variousevents in the first, second and third observing runs (O1, O2 and O3). Ourprevious study also shows the low significance of echo signals from events inO1 and O2, though, we observe that more than half of the events have p-valuesmaller than 0.1 when the simply modeled waveform is used for the analysis.Since there are only nine events appropriate for this analysis in O1 and O2, itis necessary to analyze more events to evaluate the significance statistically.In this study, we search for echo signals from binary black hole eventsobserved during O3 operated by LIGO, Virgo and KAGRA collaborations. We performthe template-based search by using two different models for echo signaltemplates: simply modeled one and physically motivated one. Our results showthat the distributions of p-values for all events analyzed in this study areconsistent with the noise distribution. This means that no significant echosignals are found for both models from O3 events.

Searching for gravitational wave echoes from black hole binary events in the third observing run of LIGO, Virgo, and KAGRA collaborations