Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..75...47m&link_type=abstract
(Symposium on Cosmic Gamma-Ray Bursts, Toulouse, France, Nov. 26-29, 1979.) Astrophysics and Space Science, vol. 75, no. 1, Mar.
Astronomy and Astrophysics
Astronomy
93
Galactic Radiation, Gamma Ray Astronomy, Spaceborne Experiments, Venera Satellites, Bursts, Energy Spectra, Pulsars, Radiation Detectors, X Ray Sources
Scientific paper
Results of investigations of cosmic gamma-ray bursts carried out using the KONUS experiment on board the Venera 11 and 12 spacecraft are discussed. The KONUS instrumentation is presented as a system of six scintillation detectors aligned along a Cartesian axis system with associated gamma-burst detectors, trigger-time measurement system, counters, time analyzer pulse height analyzer and logic. Gamma burst source direction is determined both by triangulation from the wave front arrival time difference at the two spacecraft and from the data of the six detectors with an anisotropic angular sensitivity. During the period from September 1978 to May 1979, the KONUS instruments detected 85 bursts and over 300 solar X-ray flares. Analysis of the dependence of gamma-burst occurrence frequency on burst intensity indicates a large spread in the magnitude of the total energy generated in the sources and a large distance to the sources, which, however, are found to be galactic. Several types of gamma bursts are distinguished which differ in time profile, duration and spectral shape, and a value of 10 to the 40th to 10 to the 41st erg is estimated for burst energy. Recurrent bursts have been observed from a flaring X-ray pulsar in Dorado, and a source in the short burst class. Results are interpreted in terms of a model of unsteady accretion onto a neutron star in a binary system.
Golenetskii Sergey V.
Mazets E. P.
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