Veritas is a ground-based gamma-ray telescope array located in southern Arizona in the United States. It consists of four 12m optical reflectors which are used to observe very high-energy gamma rays (>100 GeV). The array has an angular resolution of 0.1 degrees, making it one of the most sensitive gamma-ray telescopes in the world.
Gamma rays are the most energetic form of electromagnetic radiation and are produced by some of the most extreme astronomical objects, such as supermassive black holes and pulsars. Veritas is designed to study these objects and understand how they work.
The telescope uses a technique called stereoscopic imaging, which involves taking two or more images of the same object from different angles. This allows the telescope to create a 3D image of the object, which can be used to measure its size, shape, and rotation.
Veritas has been used to study a variety of astronomical objects, including active galactic nuclei (AGN), gamma ray bursts (GRBs), and pulsars. In 2018, the telescope made headlines when it detected a faint signal from a GRB that was 10 times weaker than any other GRB ever observed. This discovery proved that GRBs can be detected at much lower energies than previously thought possible.