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The Compactness Problem in GRBs has been resolved by invoking the Lorentzfactors associated with the relativistic bulk motion. This scenario applies toGRBs where sufficient energy is converted to accelerate the ejected matter torelativistic speeds. In some situations this may not be a possible mechanism.Hence the gamma rays are trapped in the region. Here we look at these possiblescenarios, where the neutrino pair production process dominates, and theneutrinos are able to escape freely. This could give a scenario where releaseof neutrinos precedes the gamma ray emission, which is much attenuated,possibly explaining why fewer GRBs are observed than what is expected.

Gammaless GRBs?