  We present ERNIE, a computer program which generates nuclear reactor electron
antineutrinos and inverse beta decay events induced by these particles, using
the Monte-Carlo method. The program allows the usage of different antineutrino
energy spectra models and can simulate the time evolution of the overall
antineutrino spectrum because of the burn-up effect. The output of the program
can readily be used in detector simulations made with eg. GEANT 4.
