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