Abstract-Temporal and energy characteristics of the very-high-energy gamma-ray bursts from evaporating primordial black holes have been calculated by assuming that the photospheric and chromospheric effects are negligible. The technique of searching for such bursts on shower arrays is described. We show that the burst time profile and the array dead time should be taken into account to interpret experimental data. Based on data from the Andyrchy array of the Baksan Neutrino Observatory (Institute for Nuclear Research, Russian Academy of Sciences), we have obtained an upper limit on the number density of evaporating primordial black holes in a local region of space with a scale size of ∼ 10

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We report results of the search for high energy GRBs and high energy radiation in correlation with GRBs. The search has been performed at "Andyrchy" EAS array, for this purpose the single particle counting rate of the array has been used. The data were collected during 1996 – 2006 years with a live time 2290 days

Abstract. Multiplicity spectrum of muon bundles underground, with E µ ≥ f ew × 100 GeV, is an effective tool for study of primary Cosmic Ray spectrum and composition in wide range of the primary energies. In this paper we study integral muon number distribution measured at the Baksan Underground Scintillation Telescope (BUST). The analyzed range of the number of muon tracks crossing BUST (1 -170) approximately corresponds to the primary energy range 1 − 104 TeV. The analysis shows that non-power law primary spectra are preferable below the knee. Such a spectrum can be obtained as superposition of the basic power law primary spectrum and an additional component from nearby supernova remnant in the Galaxy.

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