In April, another gamma-ray observatory
called Swift found the most distant gamma-ray burst ever, a 10-second flash emanating from a region more than 13 billion light-years from Earth (SN Online: 4/28/09).
Back in June 1991, just before the launch of NASA's Compton Gamma-Ray Observatory
, astronomers knew of gamma rays from exactly one galaxy beyond our own.
Data from the planned Cherenkov Telescope Array, a ground-based gamma-ray observatory
, and scheduled upgrades to the DESY ALPS particle-physics experiment in Germany, could reveal if photons do change their stripes.
ESA's (European Space Agency's) Integral satellite, an orbiting gamma-ray observatory
, recorded the entire event, providing information for what may prove to be one of the most important gamma-ray bursts (GRBs) seen in recent years.
The Swift gamma-ray observatory
, to be launched in 2003, may settle the issue.
NASA's Fermi gamma-ray observatory
has revealed a pair of enormous gamma-ray-emitting bubbles, each 25,000 light-years tall, extending north and south from the Milky Way's center.
, scheduled for launch next year, may suffer a similar fate.
Currently the AAVSO has a program to follow the visual behavior of several blazars that are being monitored at higher energies by VERITAS (Very Energetic Radiation Imaging Telescope Array System), a ground-based gamma-ray observatory
in Arizona that works in conjunction with ESA's XMM-Newton X-ray satellite.
For years we've been calling NASA's newest and best gamma-ray observatory
the Gamma-ray Large Area Space Telescope, or GLAST (June issue cover story).
NASA's Swift gamma-ray observatory
completed three years in space on November 20th, by which time it had discovered 284 GRBs.
EUROPEAN ASTRONOMERS using the HESS (High Energy Stereoscopic System) gamma-ray observatory
in Namibia have found a beautiful physics demonstration in Scutum.
An added bonus is the section on space-based observatories highlighting big names like Hubble and Chandra next to small guys like the Integral gamma-ray observatory
and the Far Ultraviolet Space Explorer (FUSE).