  We report a new binary black hole merger in the publicly available LIGO First
Observing Run (O1) data release. The event has an inverse false alarm rate of
one per six years in the detector-frame chirp-mass range $\mathcal{M}^{\rm det}
\in [20,40]M_\odot$ in a new independent analysis pipeline that we developed.
Our best estimate of the probability that the event is of astrophysical origin
is $P_{\rm astro} \sim 0.71\, .$ The estimated physical parameters of the event
indicate that it is the merger of two massive black holes, $\mathcal{M}^{\rm
det} = 31^{+2}_{-3}\,M_\odot$ with an effective spin parameter, $\chi_{\rm eff}
= 0.81^{+0.15}_{-0.21}$, making this the most highly spinning merger reported
to date. It is also among the two highest redshift mergers observed so far. The
high aligned spin of the merger supports the hypothesis that merging binary
black holes can be created by binary stellar evolution.
