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A search for ultra-high energy counterparts to gamma-ray bursts |
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| Authors: | S. P. Plunkett M. Delaney B. McBreen K. J. Hurley C. T. O'Sullivan |
| Affiliation: | (1) School of Physics and Space Research, University of Birmingham, B15 2TT Birmingham, U.K.;(2) Physics Department, University College, Dublin 4, Ireland;(3) Physics Department, University College, Cork, Ireland |
| Abstract: | A small air shower array operating over many years has been used to search for ultra-high energy (UHE) gamma radiation (  50 TeV) associated with gamma-ray bursts (GRBs) detected by the BATSE instrument on the Compton Gamma-Ray Observatory (CGRO). Upper limits for a one minute interval after each burst are presented for seven GRBs located with zenith angles < 20°. A 4.3 excess over background was observed between 10 and 20 minutes following the onset of a GRB on 11 May 1991. The confidence level that this is due to a real effect and not a background fluctuation is 99.8%. If this effect is real then cosmological models are excluded for this burst because of absorption of UHE gamma rays by the intergalactic radiation fields. |
| Keywords: | Gamma rays:bursts Gamma rays:high energy Air showers |
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