Speaker
Description
The experiment Argo-(Tibet 4300 m asl) has demonstrated the great RPC potential for gamma ray astrophysics with ground-based detectors. The Argo most relevant point was its very low energy threshold, approaching 100 GeV, which allowed to detect soft Extensive Air Showers (EAS) down to unprecedented energies. This feature offers a unique opportunity for the detection of Gamma Ray Bursts (GRB) at ground. Indeed, the gravitational collapse of a large mass emits, after a first 1 MeV burst, gamma rays of increasing energy. This late emission, lasting up a few days, can reach energies approaching 1 PeV. The challenge proposed in this talk is to follow the time evolution of a GRB starting from the minimum energy detectable at ground up to the burst extinction. A large area gamma ray observatory, combining RPCs and water-Cherenkov detectors, located in the Andes, would offer a unique possibility of exploring the southern hemisphere and center of our galaxy. This talk will present a new RPC generation optimized for mapping the secondary particles of an EAS reaching the ground. the simulation. Moreover, the simulation work course for lowering the EAS energy threshold down to a few tens of GeV and for selecting methods of gamma-hadron discrimination