  We present a comprehensive study of the active dM4e star GJ 1243. We use
previous observations and ground-based echelle spectroscopy to determine that
GJ 1243 is a member of the Argus association of field stars, suggesting it is
$\sim 30-50$ Myr old. We analyze eleven months of 1-minute cadence data from
Kepler, presenting Kepler flare frequency distributions, as well as determining
correlations between flare energy, amplitude, duration, and decay time. We find
that the exponent $\alpha$ of the power-law flare energy distribution varies in
time, primarily due to completeness of sample and the low frequency of
high-energy flares. We also find a deviation from a single power law at high
energy. We use ground-based spectroscopic observations simultaneous with the
Kepler data to provide simultaneous photometric and spectroscopic analysis of
three low-energy flares, the lowest-energy dMe flares with detailed spectral
analysis to date on any star. The spectroscopic data from these flares extend
constraints for radiative hydrodynamic (RHD) flare models to a lower energy
regime than has previously been studied. We use this simultaneous spectroscopy
and Kepler photometry to develop approximate conversions from the
\textit{Kepler} bandpass to the traditional $U$ and $B$ bands. This conversion
will be a critical factor in comparing any Kepler flare analyses to the canon
of previous ground-based flare studies.
