Gamma-ray bursts from neutron star glitches

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Scientific paper

THERE is no lack of proposed explanations for gamma-ray bursts. A large amount of observational facts and theoretical arguments has been assembled recently1. The basic facts are: • The occurrence, several times every year, of short bursts of high energy photons. These events last ~ seconds and cover the spectral range between keV up to about 1 MeV. • The total flux at the earth is roughly between 3×10-6 erg cm-2 and 5×10-4 erg cm-2. • The bursts consist of distinct components, often two in each event. The time interval between components ranges from about 1 s up to about 30 s (a much more rapid intensity variation exists within each component). • The angular distribution is roughly consistent with isotropy. The sources are either extragalactic or fairly local (say, within a few hundred parsecs). An analysis of the data now available yields a relationship for the `number of courses as a function of intensity' which has been interpreted as favouring a local origin2.

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