Table 6: Formation rates for each possible GRB progenitor type, for $\lambda = 0.5$ .
Scenario Type Fate Birthrate [yr^-1]

A He-shell RLOF CO-BH merger 5.64 $\times$ 10^-6

B pre He-shell RLOF He-BH merger 3.83 $\times$ 10^-5

C CO + BH collapsar? 1.39 $\times$ 10^-7

**Table 6:** Formation rates for each possible GRB progenitor type, for $\lambda = 0.5$ .
Scenario	Type	Fate	Birthrate [yr^-1]
A	He-shell RLOF	CO-BH merger	5.64 $\times$ 10^-6
B	pre He-shell RLOF	He-BH merger	3.83 $\times$ 10^-5
C	CO + BH	collapsar?	1.39 $\times$ 10^-7

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