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Neutrino telescopes are opening new opportunities in observational highenergy astrophysics. In these detectors, atmospheric muons from primary cosmicray interactions in the atmosphere play an important role. They provide themost abundant source of events for calibration and for testing thereconstruction algorithms. On the other hand, they represent the majorbackground source. The simulation of a statistically significant number ofmuons in large volume neutrino telescopes requires a big effort in terms ofcomputing time. Some parameterizations are currently available, but they do notexplicitly take into account the arrival of muons in bundles. A fast MonteCarlo generator (MUPAGE) was developed to generate single and multipleatmospheric muon events in underwater/ice neutrino telescopes. The code reducesthe computing time for the simulation of atmospheric muons significantly. Theevent kinematics is produced on the surface of a user-defined cylinder,virtually surrounding the detector volume. The flux of muon bundles atdifferent depths and zenith angles, the lateral spread and the energy spectrumof the muons in the bundles are based on parametric formulas. These formulaswere obtained according to a specific primary cosmic ray flux model andconstrained by the measurements of the muon flux in the MACRO undergroundexperiment. Some MUPAGE applications are presented.

MUPAGE: a fast atmospheric MUon GEnerator for neutrino telescopes based on PArametric formulas