Astronomy and Astrophysics – Astronomy
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134..301z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 2, May 1984, p. 301-305.
Astronomy and Astrophysics
Astronomy
12
Gamma Ray Absorption, Gamma Ray Astronomy, Gamma Ray Bursts, Supernova Remnants, Absorptivity, Collimation, Particle Collisions, Photons, Spectral Energy Distribution
Scientific paper
Absorption of gamma-rays above the source of their burst on March 5, 1979 is considered, in order to measure their distance. The results of a spherical model of the gamma-ray burst shows that unless the photons were collimated during the burst, the gamma-gamma optical thickness above an isotropically emitting burst source would be as high as 10 to the 5th or 10 to the 7th. After a discussion of the possibility of anisotropic emission and the properties of a pair atmosphere created by the gamma-photons, it is concluded that the requirement that non-collimated gamma photons emerged from the source on a millisecond time-scale leads to a distance estimate for the March 5, 1979 gamma-ray burst of at most several hundred pc, and not the 55 kpc determined in previous studies. This means that the burst could not have emanated from the supernova remnant N 49 in the Large Magellanic Cloud.
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