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 GeV 1 TeV) 10 4 10 3 erg cm 2 for the events with zenith angle 10 GeV can reach the detector level; although the number of sec- ondary particles is too small to reconstruct the primary direction, GRBs could be detected as a short time increase in the single particle counting rate. The background con- sists of e and generated by low energy cosmic rays. All sources of background modulation have time scales (hours) much larger than the typical GRB duration (sec- onds), hence they do not aect the GRBs search. The EASTOP experiment is running since 1991 at Campo Imperatore in Italy, at 2000 m a.s.l. The ar- ray is devoted to the measurement of the various com- ponents of extensive air showers. In the GRBs search
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