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In the first Gravitational-Wave Transient Catalogue of LIGO and Virgo, allevents are announced having zero eccentricity. In the present paper, weinvestigate the performance of SEOBNRE which is a spin-aligned eccentricwaveform model in time-domain. By comparing with all the eccentric waveforms inSXS library, we find that the SEOBNRE coincides perfectly with numericalrelativity data. Employing the SEOBNRE, we re-estimate the eccentricities ofall black hole merger events. We find that most of these events allow apossibility for existence of initial eccentricities at 10 Hz band, but aretotally circularized at the observed frequency ($ \gtrsim 20$ Hz). The upcomingupdate of LIGO and the next generation detector like as Einstein Telescope,will observe the gravitational waves starting at 10 Hz or even lower. If theeccentricity exists at the lower frequency, it may significantly support thedynamical formation mechanism taking place in globular clusters.

Investigating eccentricities of the binary black hole signals from the LIGO-Virgo catalog GWTC-1