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We propose a new type of electromagnetic transients associated with the birthof binary black holes (BBHs), which may lead to merger events accompanied bygravitational waves in $\sim0.1-1$ Gyr. We consider the newborn BBHs formedthrough the evolution of isolated massive stellar binaries. For a close massivebinary, consisting of a primary black hole (BH) and a secondary Wolf-Rayet (WR)star that are orbiting around each other, the spin period of the WR star can betidally synchronized to its orbital period. Then, the angular momentum of theouter material of the WR star is large enough to form an accretion disk arounda newborn, secondary BH, following its core-collapse. This disk may produce anenergetic outflow with a kinetic energy of $\sim10^{50}-10^{52}$ erg and anoutflow velocity of $\sim10^{10}\rm~cm~s^{-1}$, resulting in an opticaltransient with an absolute magnitude from $\sim -14$ to $\sim-17$ with aduration of around a day. This type of transient also produces detectable radiosignals $\sim1-10$ years after the birth of BBHs, via synchrotron emission fromnon-thermal electrons accelerated at external shocks. The predicted opticaltransients have a shorter duration than ordinary core-collapse supernovae.Dedicated optical transient surveys can detect them, and distinguish it fromordinary SNe using the different features of its light curve and late-timespectrum. In the paper I, we investigate disk-driven outflows from thesecondary BH, whereas possible signals from the primary BH will be discussed inthe paper II.

Outflow-Driven Transients from the Birth of Binary Black Holes I: Tidally-Locked Secondary Supernovae