Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199.1007b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, June 1982, p. 1007-1015.
Astronomy and Astrophysics
Astronomy
1
Black Holes (Astronomy), Cosmic Ray Showers, Energetic Particles, Gamma Ray Bursts, Upper Atmosphere, Electron Photon Cascades, Particle Flux Density, Scintillation Counters, Solar System
Scientific paper
A ground-based experiment to detect cosmic gamma-ray bursts (GRB) in which the individual gamma-rays at the top of the atmosphere have energies in the GeV range has been in operation at Ootacamund, India, for nearly 1.5 years. Not a single event was observed, although five of the GRB seen by satellite-borne detectors in the MeV energy range were in the view of and potentially observable by our experiment. Details of the experimental results and their implications to the phenomenon of GRB are presented. The experiment also enables us to place a 99% confidence level upper limit to the rate of explosions of primordial black holes (Hawking process) in the vicinity of the solar system at a value of 1600 or 5700/yr per cu pc, depending on whether the explosions take place according to an elementary or a composite particle hypothesis, respectively.
Bhat Narayan P.
Gopalakrishnan N. V.
Gupta Kumar S.
Ramana Murthy P. V.
Sreekantan B. V.
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