  We discuss the future of gravitational theories in the framework of
gravitational wave (GW) astronomy after the recent GW detections (the events
GW150914, GW151226, GW170104, GW170814, GW170817 and GW170608). In particular,
a calculation of the frequency and angular dependent response function that a
GW detector would see if massive modes from f(R) theories or scalar tensor
gravity (STG) were present, allowing for sources incident from any direction on
the sky, is shown. In addition, through separate theoretical results which do
not involve the recent GW detections, we show that f(R) theories of gravity
having a third massless mode are ultimately ruled out while there is still room
for STG having a third (massive or massless) mode and for f(R) theories of
gravity having a third massive mode.
