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We present DES13S2cmm, the first spectroscopically-confirmed superluminoussupernova (SLSN) from the Dark Energy Survey (DES). We briefly discuss the dataand search algorithm used to find this event in the first year of DESoperations, and outline the spectroscopic data obtained from the EuropeanSouthern Observatory (ESO) Very Large Telescope to confirm its redshift (z =0.663 +/- 0.001 based on the host-galaxy emission lines) and likely spectraltype (type I). Using this redshift, we find M_U_peak = -21.05 +0.10 -0.09 forthe peak, rest-frame U-band absolute magnitude, and find DES13S2cmm to belocated in a faint, low metallicity (sub-solar), low stellar-mass host galaxy(log(M/M_sun) = 9.3 +/- 0.3); consistent with what is seen for other SLSNe-I.We compare the bolometric light curve of DES13S2cmm to fourteen similarlywell-observed SLSNe-I in the literature and find it possesses one of theslowest declining tails (beyond +30 days rest frame past peak), and is thefaintest at peak. Moreover, we find the bolometric light curves of all SLSNe-Istudied herein possess a dispersion of only 0.2-0.3 magnitudes between +25 and+30 days after peak (rest frame) depending on redshift range studied; thiscould be important for 'standardising' such supernovae, as is done with themore common type Ia. We fit the bolometric light curve of DES13S2cmm with twocompeting models for SLSNe-I - the radioactive decay of 56Ni, and a magnetar -and find that while the magnetar is formally a better fit, neither modelprovides a compelling match to the data. Although we are unable to conclusivelydifferentiate between these two physical models for this particular SLSN-I,further DES observations of more SLSNe-I should break this degeneracy,especially if the light curves of SLSNe-I can be observed beyond 100 days inthe rest frame of the supernova.

DES13S2cmm: The First Superluminous Supernova from the Dark Energy Survey