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We present a Monte-Carlo package for simulation of high-redshift supernovadata, SNOC. Optical and near-infrared photons from supernovae are ray-tracedover cosmological distances from the simulated host galaxy to the observer atEarth. The distances to the sources are calculated from user providedcosmological parameters in a Friedmann-Lemaitre universe, allowing forarbitrary forms of ``dark energy''. The code takes into account gravitationalinteractions (lensing) and extinction by dust, both in the host galaxy and inthe line-of-sight. The user can also choose to include exotic effects like ahypothetical attenuation due to photon-axion oscillations. SNOC is primarilyuseful for estimations of cosmological parameter uncertainties from studies ofapparent brightness of Type Ia supernovae vs redshift, with special emphasis onpotential systematic effects. It can also be used to compute standardcosmological quantities like luminosity distance, lookback time and age of theuniverse in any Friedmann-Lemaitre model with or without quintessence.Comment: 16 pages, 3 figure

SNOC: A Monte-Carlo simulation package for high-zsupernova observations