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