Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
Page(s) 595 - 596
DOI https://doi.org/10.1051/aas:1999366
Published online 15 September 1999
DOI: 10.1051/aas:1999366



Astron. Astrophys. Suppl. Ser. 138, 595-596

Search for high energy GRBs with EASTOP

M. Aglietta1,2 - B. Alessandro2 - P. Antonioli5 - F. Arneodo4 - L. Bergamasco2,3 - M. Bertaina2,3 - C. Castagnoli2 - A. Castellina1,2 - A. Chiavassa2,3 - G. Cini2,3 - B. D'Ettorre Piazzoli6 - G. Di Sciascio6 - W. Fulgione1,2 - P. Galeotti2,3 - P.L. Ghia1,2 - M. Iacovacci6 - G. Mannocchi1,2 - C. Morello1,2 - G. Navarra2,3 - O. Saavedra2,3 - G.C. Trinchero1,2 - P. Vallania1,2 - S. Vernetto1,2 - C. Vigorito2,3

Send offprint request: S. Vernetto


1 - Istituto di Cosmo-Geofisica del CNR, Torino, Italy
2 - Istituto Nazionale di Fisica Nucleare, Torino, Italy
3 - Dipartimento di Fisica Generale dell' Università, Torino, Italy
4 - Dipartimento di Fisica dell' Università and INFN-LNGS, L' Aquila, Italy
5 - Istituto Nazionale di Fisica Nucleare, Bologna, Italy
6 - Dipartimento di Scienze Fisiche dell' Università and INFN, Napoli, Italy
e-mail: vernetto@lngs.infn.it

Received December 18, 1998; accepted March 10, 1999

Abstract:

A search for GRBs of energy E>10 GeV has been performed by studying the single particle counting rate of the EAS array EASTOP. No candidates have been observed in coincidence with 292 BATSE GRBs and the typical upper limits obtained on the energy fluence are $F(10~{\rm GeV}\div 1~{\rm TeV})\sim 10 ^{-4}\div 10^{-3}~{\rm erg}~{\rm cm}^{-2}$ for the events with zenith angle $\theta<30^{\circ}$. A single candidate has been observed in the "all sky" survey mode during 1.5 103 days.

Key words: gamma-ray bursts

Copyright The European Southern Observatory (ESO)

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