Astrophysics and Space Science

, Volume 83, Issue 1–2, pp 279–286 | Cite as

A search for high-energy gamma rays (≥1015 eV) associated with gamma ray bursts

  • R. W. Clay
  • P. R. Gerhardy
  • A. G. Gregory


A search has been made for high-energy photons detected by an extensive air shower array in coincidence with spacecraft observations of gamma ray bursts recorded between May 1978 and May 1979. No evidence has been found for the detection of coincident energetic photons above a threshold energy of∼1015 eV. Using an array collecting area of∼30000 m2 at∼1016 eV it is found that the differential power law spectral index of the photons within a burst must exceed 1.97±0.03 over the energy range from spacecraft energies to 1016 eV. This requires a steepening of the observed spectrum above spacecraft energies.


Energy Range Spectral Index Threshold Energy Differential Power Spacecraft Observation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Co 1982

Authors and Affiliations

  • R. W. Clay
    • 1
  • P. R. Gerhardy
    • 1
  • A. G. Gregory
    • 1
  1. 1.Physics DepartmentUniversity of AdelaideAdelaide

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