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  2. Gamma ray - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray

    The first gamma ray source to be discovered was the radioactive decay process called gamma decay. In this type of decay, an excited nucleus emits a gamma ray almost immediately upon formation. [note 1] Paul Villard, a French chemist and physicist, discovered gamma radiation in 1900, while studying radiation emitted from radium.

  3. Gamma-ray astronomy - Wikipedia

    en.wikipedia.org/wiki/Gamma-ray_astronomy

    The most recent generation of gamma-ray telescopes (2000s) have a resolution of the order of 6 arc minutes in the GeV range (seeing the Crab Nebula as a single "pixel"), compared to 0.5 arc seconds seen in the low energy X-ray (1 keV) range by the Chandra X-ray Observatory (1999), and about 1.5 arc minutes in the high energy X-ray (100 keV ...

  4. GRB 221009A - Wikipedia

    en.wikipedia.org/wiki/GRB_221009A

    GRB 221009A was an extraordinarily bright and very energetic gamma-ray burst (GRB) jointly discovered by the Neil Gehrels Swift Observatory and the Fermi Gamma-ray Space Telescope on October 9, 2022. The gamma-ray burst was ten minutes long, [ 1 ] but was detectable for more than ten hours following initial detection.

  5. Energetic Gamma Ray Experiment Telescope - Wikipedia

    en.wikipedia.org/wiki/Energetic_Gamma_Ray...

    The sky as seen in high-energy gamma rays. The Energetic Gamma Ray Experiment Telescope (EGRET) was one of four instruments outfitted on NASA's Compton Gamma Ray Observatory satellite. Since lower energy gamma rays cannot be accurately detected on Earth's surface, EGRET was built to detect gamma rays while in space.

  6. Terrestrial gamma-ray flash - Wikipedia

    en.wikipedia.org/wiki/Terrestrial_gamma-ray_flash

    Artist's conception of gamma-ray flash and related phenomena. The red dots show some of the ~500 terrestrial gamma-ray flashes daily detected by the Fermi Gamma-ray Space Telescope through 2010. A terrestrial gamma-ray flash (TGF), also known as dark lightning, is a burst of gamma rays produced in Earth's atmosphere.

  7. Milagro (experiment) - Wikipedia

    en.wikipedia.org/wiki/Milagro_(experiment)

    A cosmic ray or high-energy gamma ray striking an atom in the upper atmosphere generates a cascade of particles known as an air shower. This cascade of particles are traveling near the speed of light and generate Cherenkov radiation as they pass through the atmosphere and the water in the Milagro experiment.

  8. GRB 080319B - Wikipedia

    en.wikipedia.org/wiki/GRB_080319B

    GRB 080319B was a gamma-ray burst (GRB) detected by the Swift satellite at 06:12 UTC on March 19, 2008. The burst set a new record for the farthest object that was observable with the naked eye: [2] it had a peak visual apparent magnitude of 5.7 and remained visible to human eyes for approximately 30 seconds. [3]

  9. Compton Gamma Ray Observatory - Wikipedia

    en.wikipedia.org/wiki/Compton_Gamma_Ray_Observatory

    The Compton Gamma Ray Observatory (CGRO) was a space observatory detecting photons with energies from 20 keV to 30 GeV, in Earth orbit from 1991 to 2000. The observatory featured four main telescopes in one spacecraft, covering X-rays and gamma rays , including various specialized sub-instruments and detectors.

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