GRAPES

Detector Type Ground-based Cosmic Ray Observatory
Energy Range 1 GeV to several PeV
Detector Array 4,000+ scintillation detectors
Field of View 360° (full sky coverage)
Location TIFR, India
Altitude 1,200 meters above sea level
Array Size 200,000 m² (20 hectares)
Detector Material Plastic scintillators
Photodetector Photomultiplier tubes (PMTs)
Energy Resolution 20%–30% (depending on energy)
Detection Method Air shower detection (indirect)