  The present scenario for high-luminosity long gamma-ray bursts is strongly
influenced by the paper of Fruchter et al. (2006). Whereas the main contention
of this paper that these GRBs occur in low-metallicity irregular galaxies is
based on a considerable collection of observational results and although the
main thesis is doubtless correct, the paper does not explain the dynamics that
produces such GRBs and much of the discussion not directly concerning the main
thesis is wrong. We propose a dynamics and elucidate how the Fruchter et al.
(2006) results may be tested, in our neighborhood in the LMC, suggesting that
LMC X-3 is a relic of a high luminosity explosion, probably accompanied by a
GRB and hypernova explosion. The way to test our suggestion is to measure the
system velocity of the present black hole. We correct errors of the Fruchter et
al. paper in stellar evolution, so that the study of GRBs is consistent with
it. We show that the subluminous GRB 060218 had a low-mass black hole as
central engine.
