Search for UHE counter-parts of Gamma Ray Bursts

Astronomy and Astrophysics – Astrophysics

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Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray

Scientific paper

Several Gamma Ray Bursts detected in the keV energy range by the Burst and Transient Source Experiment (BATSE) have been observed by the Energetic Gamma Ray Experiment Telescope (EGRET) in the MeV/GeV energy range. The energy spectra of γ-rays in some of the bursts continues from keV to GeV without a break or any evidence for a high energy cut-off. If the same slope continues up to the PeV range the expected γ-ray flux falls within the sensitivity of the Extensive Air Shower array operating at the Kolar Gold Fields, India. In view of the enormous astrophysical implications of the results, we have conducted a systematic search for PeV γ-rays from the locations of about 39 high fluence GRB's detected during April 1991 and March 1993. The results of a search from 8 highest fluence GRB's are presented here.

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