Using the High Altitude Water Cherenkov Gamma-Ray Observatory
, a different team of researchers collected readings of gamma rays exceeding 100 trillion electron volts.
It was in order to detect these extremely short flashes, and hence gamma-ray emissions, that fourteen countries set up the HESS array(1), the world's largest gamma-ray observatory
, in Namibia in 2002.
The European Space Agency's Integral gamma-ray observatory
confirmed the outburst.
With more than 100 telescopes located in the northern and southern hemispheres, CTA will be the world's largest and most sensitive highenergy gamma-ray observatory
(5) Super-Kamiokande:A facility consisting of a subterranean pool used as a Cherenkov-ray collector located in Kamioka, Gifu Prefecture, Japan.6 Sun's cosmic-ray shadow:A phenomenon in which cosmic rays (high-energy charged particles that move through space) are deflected by the sun's magnetic field.7 Ground-based gamma ray observatory, CTA:A future ground-based gamma-ray observatory
planned to come online in 2020 with 10 times the sensitivity of existing gamma-ray telescopes.
NASA's Compton Gamma-Ray Observatory
, which operated in the 1990s, detected high-energy flares, but the galaxy was quiet during Fermi's first two and a half years in orbit.
The first were found by NASA's Compton Gamma-ray Observatory
in the early 1990s.
The telescope will add to the work of the Hubble Telescope, launched in 1990, the Chandra X-ray Observatory, launched in 1999, and the Compton Gamma-Ray Observatory
, which operated for nine years before falling back into Earth's atmosphere in 2000.
The Advanced X-ray Astrophysics Facility is scheduled for launch in August, 1998, and will join NASA's Hubble Space Telescope and Compton Gamma-ray Observatory
in exploring the universe.
Using data from the High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory
in Mexico, the scientists found that two nearby pulsars - despite being the right age and at the right distance to be likely candidates for the excess positrons - are actually "surrounded by an extended murky cloud that prevents most positrons from escaping."