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   <subfield code="a">Search for cosmic γ-ray bursts in the (1÷50) GeV energy range</subfield>
   <subfield code="h">[Elektronische Daten]</subfield>
   <subfield code="c">[M. Aglietta, B. Alessandro, P. Antonioli, F. Arneodo, L. Bergamasco, A. Fauth, C. Castagnoli, A. Castellina, C. Cattadori, A. Chiavassa, G. Cini, B. Piazzoli, W. Fulgione, P. Galeotti, P.L. Ghia, G. Mannocchi, C. Morello, G. Navarra, L. Riccati, O. Saavedra, G. Trinchero, P. Vallania, S. Vernetto]</subfield>
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   <subfield code="a">Summary: A search for cosmic gamma-ray bursts in the GeV energy range has been performed by means of the EAS-TOP Extensive Air Shower array at Campo Imperatore (Gran Sasso Laboratories) during the period March-December 1990. In 2566.5 hours of measurement the obtained upper limit to the rate of bursts of amplitude &gt;2% of the cosmic-ray intensity and time duration τ=1 s, isR≤7.9y−1 (90% c.l.). Assuming for γ-rays a differential energy spectrumS(E 0 )≈E 0 −2.5 , the corresponding upper limit to the energy flux of γ-rays with energy &gt;5 GeV in bursts of duration τ≤1 s is Φ&lt;8.3·10−5erg cm−2.</subfield>
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   <subfield code="a">Società Italiana di Fisica, 1992</subfield>
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