  Keane et al. recently detected a fading radio source following FRB 150418,
leading to the identification of a putative host galaxy at $z = 0.492 \pm
0.008$. Assuming that the fading source is the afterglow of FRB 150418, I model
the afterglow and constrain the isotropic energy of the explosion to be a few
$10^{50}$ erg, comparable to that of a short duration GRB. The outflow may have
a jet opening angle of $\sim 0.22$ rad, so that the beaming-corrected energy is
below $10^{49}$ erg. The results rule out most FRB progenitor models for this
FRB, but may be consistent with either of the following two scenarios. The
first scenario invokes a merger of an NS-NS binary, which produced an
undetected short GRB and a supra-massive neutron star, which subsequently
collapsed into a black hole, probably 100s of seconds after the short GRB. The
second scenario invokes a merger of a compact star binary (BH-BH, NS-NS, or
BH-NS) system whose pre-merger dynamical magnetospheric activities made the
FRB, which is followed by an undetected short GRB-like transient. The
gravitational wave (GW) event GW150914 would be a sister of FRB 150418 in this
second scenario. In both cases, one expects an exciting prospect of GW/FRB/GRB
associations.
