Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..83..279c&link_type=abstract
Astrophysics and Space Science, vol. 83, no. 1-2, Apr. 1982, p. 279-286.
Astronomy and Astrophysics
Astrophysics
6
Cosmic Ray Showers, Energetic Particles, Energy Spectra, Gamma Ray Bursts, Photon Density, Galactic Radiation, Scintillation Counters, Sea Level, Spacecraft Instruments, Stellar Radiation
Scientific paper
An attempt is made to set a meaningful upper limit on the flux of extremely high energy photons associated with the gamma bursts by attempting to correlate arrival times of gamma bursts observed by spacecraft with those of extensive air showers observed at sea level between May 1978 and May 1979. No evidence has been found for the detection of coincident energetic photons above a threshold energy of about 10 to the 15th eV. Using an array collecting area of about 30,000 sq m at about 10 to the 16th eV, it is found that the differential power law spectral index of the photons within a burst must exceed 1.97 + or - 0.03 over the energy range from spacecraft energies to 10 to the 16th eV. This requires steepening of the observed spectrum above spacecraft energies.
Clay Roger William
Gerhardy P. R.
Gregory A. G.
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