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This paper compares the population of BBH mergers detected by LIGO/Virgo withselected long GRB world models convolved with a delay function (LGRBs are usedas a tracer of stellar mass BH formation). The comparison involves the redshiftdistribution and the fraction of LGRBs required to produce the local rate ofBBH mergers.  We find that BBH mergers and LGRBs cannot have the same formation history,unless BBHs mergers have a long coalescence time of several Gyr. This wouldimply that BHs born during the peak of long GRB formation at redshift z~2-3merge within the horizon of current GW interferometers. We also show that LGRBsare more numerous than BBH mergers, so that most of them do not end their livesin BBH mergers.  We interpret these results as an indication that BBH mergers and LGRBsconstitute two distinct populations of stellar mass BHs, with LGRBs being morefrequent than BBH mergers. We speculate that the descendants of LGRBs mayresemble galactic High-Mass X-Ray Binaries more than BBH mergers. We finallydiscuss the possible existence of a sub-population of fast-spinning LGRBsdescendants among BBH mergers, showing that this population, if it exists, isexpected to become dominant beyond redshift z ~ 1, leading to a change in theobserved properties of BBH mergers.

Are binary black hole mergers and long gamma-ray bursts drawn from the same black hole population?