  Novae have long been expected to be sources of emission at several MeV from
the decay of radioactive elements in the novae ejecta, however, they were not
anticipated to be sources of continuum emission in the GeV energy domain. In
March 2010 the Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space
Telescope discovered for the first time >100 MeV gamma-ray emission from a nova
within our galaxy, V407 Cyg. The high-energy spectrum and light curve was
explained as a consequence of shock acceleration in the nova shell as it
interacts with the local ambient medium. While this was an exciting and
important discovery it was suspected that the necessary conditions for
high-energy emission from novae would be rare. In June 2012 the LAT detected
two new transient sources that have been associated with classical novae
observed in the optical, Nova Sco 2012 and Nova Mon 2012. We report on the
observational properties of the population of gamma-ray novae, their
similarities and differences and the emission processes that generate the high
energy radiation in these systems.
