Search for cosmic γ-ray bursts in the (1÷50) GeV energy range |
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| Authors: | M. Aglietta, B. Alessandro, P. Antonioli, F. Arneodo, L. Bergamasco, A. Campos Fauth, C. Castagnoli, A. Castellina, C. Cattadori A. Chiavassa etAlia" >,et al. |
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| Affiliation: | (1) Istituto di Cosmo-Geofisica del CNR, Torino, Italia;(2) Sezione di Torino, INFN, Torino, Italia;(3) Istituto di Fisica dell’Università, Torino, Italia;(4) Instituto de Fisica, Universidade Estadual de Campinas, Campinas, Brazil;(5) Sezione di Milano, INFN, Milano, Italia;(6) Dipartimento di Scienze Fisiche dell’Università, Napoli, Italia |
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| Abstract: | 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 >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 >5 GeV in bursts of duration τ≤1 s is Φ<8.3·10−5erg cm−2. |
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| Keywords: | Cosmic-ray interactions with the Earth |
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