Probable optical counterpart of a Gamma-ray burster

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Flare Stars, Gamma Ray Bursts, Gamma Ray Astronomy, Neutron Stars, Stellar Evolution, Stellar Mass Accretion, Thermonuclear Explosions

Scientific paper

Sixteen million seconds, or over a half year, of optical monitoring of three Gamma-ray burst positions using the Harvard College Observatory collection of archival plates are described. The probable optical counterpart of the November 19, 1978 Gamma-ray burster has been discovered on a blue emulsion plate exposed in 1928. Optical searches indicate that the absolute magnitude of the Gamma-ray burst system at quiescence is fainter than 13, and a recurrence rate of about 10 to the -7.5/sec is found from Gamma-ray and optical data. Such a high recurrence rate precludes any model which uses a collision between a neutron star and an asteroid-like body, as well as any model requiring accretion from the interstellar matter onto a neutron star.

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