Gamma-ray telescopes

Telescope Name	Location	Frequency Range	Number of Antennas	Key Scientific Objectives	Notable Features
Fermi Gamma-ray Space Telescope (formerly GLAST)	Space (NASA mission)	8 keV–300 GeV	Space telescope	Gamma-ray bursts, active galactic nuclei, cosmic rays	Large Area Telescope (LAT) and Gamma-ray Burst Monitor (GBM) for high sensitivity across a wide energy range
HESS (High Energy Stereoscopic System)	Namibia	100 GeV–100 TeV	Ground-based, imaging atmospheric Cherenkov telescope	Supernova remnants, pulsars, black holes	Array of telescopes providing very high energy gamma-ray imaging with stereoscopic capabilities
VERITAS (Very Energetic Radiation Imaging Telescope Array System)	Arizona, USA	50 GeV–50 TeV	Ground-based, imaging atmospheric Cherenkov telescope	Active galactic nuclei, pulsars, gamma-ray bursts	High-resolution gamma-ray imaging; focuses on transient and high-energy sources
MAGIC (Major Atmospheric Gamma Imaging Cherenkov Telescopes)	La Palma, Canary Islands, Spain	30 GeV–100 TeV	Ground-based, imaging atmospheric Cherenkov telescope	Gamma-ray bursts, black holes, dark matter	Sensitive to very high-energy gamma rays; dual-telescope system for improved sensitivity
INTEGRAL (INTErnational Gamma-Ray Astrophysics Laboratory)	Space (ESA mission)	15 keV–10 MeV	Space telescope	Gamma-ray bursts, black holes, neutron stars	Combines gamma-ray, X-ray, and optical detectors; high spectral and angular resolution
SWIFT BAT (Burst Alert Telescope)	Space (NASA mission)	15–150 keV	Space telescope	Gamma-ray bursts, transient events, supernovae	Rapid response and localization for gamma-ray bursts, multi-wavelength follow-up capabilities
AGILE (Astro-rivelatore Gamma a Immagini Leggero)	Space (ASI mission, Italy)	30 MeV–50 GeV	Space telescope	Gamma-ray bursts, pulsars, black holes	High-resolution gamma-ray imaging, rapid alert system for transient events
CTA (Cherenkov Telescope Array)	Under construction (Chile and Spain)	20 GeV–300 TeV	Ground-based, imaging atmospheric Cherenkov telescope	Dark matter, cosmic rays, supernova remnants	Next-generation gamma-ray observatory, array of 100+ telescopes for ultra-high sensitivity
COMPTEL (Compton Telescope on CGRO)	Space (NASA mission, decommissioned in 2000)	0.75–30 MeV	Space telescope	Galactic sources, gamma-ray bursts, cosmic rays	First telescope to map the gamma-ray sky at MeV energies; part of Compton Gamma Ray Observatory (CGRO)
LAT (Large Area Telescope on Fermi)	Space (part of Fermi mission)	20 MeV–300 GeV	Space telescope	Active galactic nuclei, gamma-ray bursts, cosmic rays	High sensitivity and wide field of view; maps the gamma-ray sky with excellent angular resolution