Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..215o&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
The Large Area Air Shower (LAAS) group has been collecting extensive air shower (EAS) data by compact EAS arrays simultaneously operating at eleven sites in Japan. Working since 1996, a large number of EAS data have been accumulated and they are analyzed in this report. In order to find out signals from short-lived burst activities in the universe, we insp ect EAS trigger rates of short time windows and search for sporadic excess events in them. Significant events are furthermore employed to explore possible correlations with cosmic phenomena such as gamma-ray bursts, cluster events observed by AGASA and highest energy cosmic rays by AGASA and HiRes. Particularly, our EAS arrays in Okayama area, of which trigger conditions are uniformly set at 2-fold coincidence of adjacent counters since 2002, are expected to be more sensitive to such sporadic phenomena because they can be triggered by lower energy primary particles. The results using all LAAS data will be presented at the conference.
Iyono Atsushi
Konishi Tetsuro
LAAS Group
Nakamura Takashi
Nakatsuka Takao
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