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In a recent search (Kim et al. 2022), we looked for microlensing signature ingravitational waves from spectrograms of the binary black hole events in thefirst and second gravitational-wave transient catalogs. For the search, we haveimplemented a deep learning-based method (Kim et al. 2021) and figured out thatone event, GW190707 093326, out of forty-six events, is classified into thelensed class. However, upon estimating the p-value of this event, we observedthat the uncertainty of the p-value still includes the possibility of the eventbeing unlensed. Therefore, we concluded that no significant evidence of beatingpatterns from the evaluated binary black hole events has found from the search.For a consequence study, we discuss the distinguishability between microlensedgravitational waves and the signal from precessing black hole binaries.

Search for Microlensing Signature in Gravitational Waves from Binary Black Hole Events