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We consider a scenario for the longest duration gamma ray bursts, resultingfrom the collapse of a massive star in a close binary system with a companionblack hole. The primary black hole born during the core collapse is spun up andincreases its mass during the fallback of the stellar envelope. The companionblack hole provides an additional angular momentum to the envelope, whichultimately makes the core BH spinning with a high Kerr parameter. After theinfall and spiral-in, the two black holes merge inside the circumbinary disk.The second episode of mass accretion and final, even larger spin of thepost-merger black hole prolongs the gamma ray burst central engine activity.The observed events should have two distinct peaks in the electromagneticsignal, separated by the gravitational wave emission. The gravitational recoilof the burst engine is also possible.

Accretion and outflow in the gamma ray bursts from black hole binary systems