Gamma Rays observation with EAS detectors

Large extensive air shower (EAS) arrays provide complementary technology for observation of very high-energy gamma rays. Whereas their instantaneous sensitivity is currently a factor ∼ 150 less than that of imaging atmospheric Cherenkov telescopes (IACTs), their large field of view (∼ 90 deg; 1.8 sr) and nearly 100% duty cycle makes these observatories particularly suited to conduct all-sky surveys and to detect emission from extended astrophysical sources. Due to the wide field of view coverage of the sky and uninterrupted operation, the EAS technique has also the potential to detect of very high energy (VHE) transient phenomena.