Gamma ray bursts are among the prime suspects as the sources of ultra-high energy (UHE) cosmic rays (CRs). Not only are these objects capable of accelerating nuclei to the extreme energies so far detected but they can also supply enough power to sustain the energy density of UHE CRs. The production of high energy neutrinos would be an unavoidable consequence of the acceleration of nuclei in the presence of the intense radiation field of the GRB. The IceCube experiment has been looking for this neutrino emission associated with GRBs detected by the SWIFT and Fermi satellites between May 2008 and April 2010. Whereas typical models predict at least a few observable neutrinos during this period IceCube found none. I will discuss how this non-observation challenges the UHE CR paradigm of GRBs.
