Institut de recherche sur les lois fondamentales de l'Univers

The construction of IceCube, a kilometer-scale neutrino detector at the South Pole, has recently been completed. The detector has an unprecedented sensitive to high energy neutrinos of astrophysical origin. After a general introduction I will focus on the search for neutrino emission from Gamma-Ray Burts and Supernovae, two of the prime candidate sources of high energy neutrinos. I will present first results of a novel optical follow-up program that significantly improves the sensitivity of IceCube to Supernovae and other transient sources. In the last part of the talk I will discuss the planed extension of IceCube towards lower energies.