Search for Ultra-High-Energy Radiation from gamma -ray Bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Using data from the CYGNUS extensive air shower array, we have searched for evidence of emission of ultra-high-energy radiation coincident with gamma -ray bursts observed by the BATSE instrument on the Compton Gamma-Ray Observatory. No statistically significant excess was found for any point in the sky within 4sigma of BATSE's best location coordinates for any of the 56 bursts examined. Furthermore, no events were seen in the 1.5(deg) radius circular bin surrounding gamma -ray burst GRB 920720, whose location was determined accurately by the Compton/Ulysses/PVO Interplanetary Network of satellites. Flux upper limits depend greatly on the actual zenith angle of the burst. Typical fluence upper limits above 100 TeV are ~ 10(-6) erg cm(-2) . The fluence upper limit for GRB 920720 is 2 times 10(-6) erg cm(-2) .

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