Abstract

We study neutrino conversions in a recently envisaged source of high energy neutrinos ( E≳10 6 GeV), i.e., in the vicinity of cosmological gamma-ray burst fireballs (GRB). We consider the effects of flavor and spin-flavor conversions and point out that, in both situations, a some what higher than estimated high energy tau neutrino flux from GRBs is expected in new km 2 surface area under water/ice neutrino telescopes.

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