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The long and short gamma-ray bursts are believed to be produced due tocollapse of massive stars and merger of compact binaries respectively. Allthese objects are rich in neutron and the jet outflow from these objects musthave a neutron component in it. By postulating the neutron anti-neutronoscillation in the gamma-ray burst fireball, we show that, 19-38 GeV neutrinosand anti-neutrinos can be produced due to annihilation of anti-neutrons withthe background neutrons. These neutrinos and anti-neutrinos will be producedbefore the 5-10 GeV neutrinos due to dynamical decoupling of neutrons from therest of the fireball. Observation of these neutrinos will shed more light onthe nature of the GRB progenitors and also be a unique signature of physicsbeyond the standard model. A possible way of detecting these neutrinos infuture is also discussed.Comment: 4 pages, two columns, revtex styl

MULTI-GeV NEUTRINOS DUE TO $n\bar n$ OSCILLATION IN GAMMA-RAY BURST FIREBALLS