Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-11-13
Nuovo Cim.C24:631-638,2001
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures, to appear on the Proceedings of the "Chacaltaya Meeting on Cosmic Ray Physics", held on July 2000, in La P
Scientific paper
A search for Gamma Ray Bursts in the GeV-TeV energy range has been performed by INCA, an air shower array working at 5200 m of altitude at the Chacaltaya Laboratory (Bolivia). The altitude of the detector and the use of the "single particle technique" allows to lower the energy threshold up to few GeVs. No significant signals are observed during the occurrence of 125 GRBs detected by BATSE, and the obtained upper limits on the energy fluence in the interval 1-1000(100) GeV range from 3.2(8.6) 10^-5 to 2.6(7.0) 10^-2 erg/cm^2 depending on the zenith angle of the events. These limits, thanks to the extreme altitude of INCA, are the lowest ever obtained in the sub-TeV energy region by a ground based esperiment.
for the INCA Collaboration
Vernetto Silvia
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