Search for muon neutrinos from GRB afterglows in the cannonball model with IceCube

Gamma-Ray Bursts (GRBs) are among the most spectacular phenomena in the Universe. They may be responsible for the production of ultra high energetic cosmic rays and neutrinos. GRBs are usually described with the Fireball model which predicts neutrino emission on time scales significantly less than a day. In contradiction to this model, the here considered Cannonball model describes the GRB by the emission of a highly relativistic baryonic cloud, a cannonball. Several cannonballs may originate from a core-collapse supernova when parts of the accretion disk fall abruptly into a black hole. While the cannonball moves through the interstellar matter, intercepted particles are accelerated inside the cannonball. This leads to a faint neutrino emission lasting for several months, correlated with the optical afterglow. In this talk we present the search for a neutrino emission in coincidence with known GRBs. Data taken with the IceCube Neutrino Observatory in its 22-string configuration from May 2007 till April 2008 are analyzed with an unbinned likelihood approach. During this time 48 GRBs were recorded in the Northern hemisphere.