  We analyze the event GW 150914 announced by the Advanced Laser Interferometer
Gravitational-Wave Observatory (LIGO) as the gravitational-wave emission of a
black-hole binary merger. We show that the parameters of the coalescing system
and of the newly formed Kerr black-hole can be extracted from basic results of
the gravitational-wave emission during the inspiraling and merger phases
without sophisticated numerical simulations. Our strikingly accurate estimates
are based on textbook formulas describing two different regimes: 1) the binary
inspiraling analysis treated in Landau and Lifshitz textbook, and 2) the plunge
of a particle into a black-hole, treated in the Rees-Ruffini-Wheeler textbook.
It is stressed that in order to infer any astrophysical information on the
masses of the system both regimes have to be independently and observationally
constrained by LIGO, which does not appear to be the case.
