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In previous papers it was shown that gamma rays with characteristics similarto those of the gamma-ray bursts (GRBs) observed by astronomers may arise fromsuitably shaped nonuniformities in the Big Bang in a quasi-spherical Szekeres(QSS) model. The gamma radiation arises by blueshifting the light emitted byhydrogen atoms at the end of the last scattering epoch along preferreddirections that exist in QSS models. However, the durations of the gammaflashes and of their afterglows implied by the model were much longer thanthose of the observed GRBs. In this paper it is shown that for the gamma-rayflash a duration of correct order results if the blueshifted radiation, on itsway to the present observer, passes through another QSS region where it isdeflected. The angle of deflection changes with time because of thecosmological drift mechanism, so the high-frequency ray will miss the observerafter a while. It is shown by explicit numerical calculation that a gamma-rayflash will no longer be visible to the present observer after 10 minutes.

Short-lived flashes of gamma radiation in a quasi-spherical Szekeres metric