Search for gamma-ray bursts in the GeV energy range at Mt. Chacaltaya (5200 m)

A. Castellina, P. L. Ghia, C. Morello, G. Trinchero, P. Vallania, S. Vernetto, G. Navarra, O. Saavedra, H. Yoshii, T. Kaneko, F. Kakimoto, Rolando Ticona Peralta, A. Velarde, Carlos Aguirre Castro

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Observations of gamma-ray bursts in the 1 GeV-1 TeV energy region are of great interest for the understanding of these mysterious events. The detection of GeV-TeV gamma-ray bursts is feasible using extensive air shower arrays monitoring the fluctuations of the single-particle counting rate. The sensitivity is strongly increased working at mountain altitudes, in particular above 5000 m. In this paper we discuss the possibility to exploit the existing BASJE EAS array operating at Mt. Chacaltaya (Bolivia) at 5200 m a.s.l. Simulations of electromagnetic showers in the atmosphere have been performed in order to evaluate the sensitivity of this experiment to detect gamma ray bursts of different time duration, spectrum slope and energy cut-off. The detector can observe events of energy fluence F(E > 1 GeV) ∼ few 10-5 erg cm-2, comparable to that measured by satellite instruments during the most intense gamma-ray bursts, provided they occurr at low zenith angles and assuming that the energy spectrum at least extends up to ∼1 TeV. In the case of events below the sensitivity of the experiment, upper limits on the high-energy tail of the spectrum can be obtained by measurements in coincidence with satellite observations.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalNuovo Cimento della Societa Italiana di Fisica C
Volume20
Issue number2
StatePublished - 1997

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