Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.3003o&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
BATSE revealed out that the gamma ray bursts, GRBs, are of extragalactic origins. Although several models are proposed to explain their production mechanism, we need to obtain more experimental information to get the final conclusion. Up to now GRBs are observed mainly with detectors boarded on spacecrafts and consequently at the limited energy range less than 10 GeV. So we plan to detect GRBs with E > 30 GeV at Mt. Chacaltaya of 5200 m a.s.l.. The result of our Monte Carlo simulations shows that at least one electron reaches at the level of Mt. Chacaltaya for air showers initiated by primary gamma rays with energies of 30 GeV and that the differences in arrival directions of the electrons and of the incident gamma rays are within 8 degrees. In this project we measure arrival directions of air shower electrons with a scintillation detector array with an angular accuracy of 11 degrees. This array has two planes of 10 m × 10 m area, which are separated vertically by 1 m and each of which consists of 1000 plastic scintillator bars. The sensitivity of this detector for GRBs with E > 30 GeV is 5 × 10-5 photons/cm2 s at 5σ significance level.
Kakimoto and BASJE Collaboration F.
Ogio Shoichi
Yamada Kazuhiko
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