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Gravitational wave echoes have been proposed as a smoking-gun signature ofexotic compact objects with near-horizon structure. Recently there have beenobservational claims that echoes are indeed present in stretches of data fromAdvanced LIGO and Advanced Virgo immediately following gravitational wavesignals from presumed binary black hole mergers, as well as a binary neutronstar merger. In this paper we deploy a morphology-independent search algorithmfor echoes introduced in Tsang et al., Phys. Rev. D 98, 024023 (2018), which(a) is able to accurately reconstruct a possible echoes signal with minimalassumptions about their morphology, and (b) computes Bayesian evidences for thehypotheses that the data contain a signal, an instrumental glitch, or juststationary, Gaussian noise. Here we apply this analysis method to all thesignificant events in the first Gravitational Wave Transient Catalog (GWTC-1),which comprises the signals from binary black hole and binary neutron starcoalescences found during the first and second observing runs of Advanced LIGOand Advanced Virgo. In all cases, the ratios of evidences for signal versusnoise and signal versus glitch do not rise above their respective "backgrounddistributions" obtained from detector noise, the smallest $p$-value being 3%(for event GW170823). Hence we find no statistically significant evidence forechoes in GWTC-1.

A morphology-independent search for gravitational wave echoes in data from the first and second observing runs of Advanced LIGO and Advanced Virgo