  Using data obtained during the RATS-Kepler project we identified one short
duration flare in a 1 hour sequence of ground based photometry of the dwarf
star KIC 5474065. Observations made using GTC show it is a star with a M4 V
spectral type. Kepler observations made using 1 min sampling show that KIC
5474065 exhibits large amplitude (deltaF/F>0.4) optical flares which have a
duration as short as 10 mins. We compare the energy distribution of flares from
KIC 5474065 with that of KIC 9726699, which has also been observed using 1 min
sampling, and ground based observations of other M dwarf stars in the
literature. We discuss the possible implications of these short duration,
relatively low energy flares would have on the atmosphere of exo-planets
orbiting in the habitable zone of these flare stars.
