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Bepposax

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From a nuclear-test detector to a cosmic beacon: the first gamma-ray burst discovered in 1967
science16 days ago

From a nuclear-test detector to a cosmic beacon: the first gamma-ray burst discovered in 1967

Discovered by the Vela satellites in 1967 while monitoring for nuclear tests, the flash proved to be the first gamma-ray burst, a mysterious deep-space event whose origin puzzled scientists for decades. Subsequent missions—BATSE on the Compton Observatory, the Interplanetary Network, and BeppoSAX—established GRBs as extragalactic and extraordinarily energetic, sometimes releasing more energy in seconds than the Sun does in its entire lifetime. By linking long-duration bursts to the deaths of massive stars and black-hole formation, researchers unveiled the GRB connection to supernovas, while later observations of high-energy afterglows have driven new questions about their underlying physics.

Vela Bursts: From Cold War Detectors to Cosmic Gamma-Ray Explosions
science2 months ago

Vela Bursts: From Cold War Detectors to Cosmic Gamma-Ray Explosions

NASA’s Vela satellites, built to monitor nuclear tests, began registering puzzling gamma-ray flashes in the late 1960s. Initially ambiguous, sixteen bursts were later identified as cosmic gamma-ray bursts, not terrestrial or solar events. Distance estimates remained contested until BeppoSAX pinpointed afterglows in 1997, proving GRBs originate billions of light-years away and transforming gamma-ray astronomy.

From Nuclear Watchdogs to Cosmic Fireworks: The Vela Satellites That Sparked Gamma-Ray Astronomy
space3 months ago

From Nuclear Watchdogs to Cosmic Fireworks: The Vela Satellites That Sparked Gamma-Ray Astronomy

The Vela satellites, built to detect secret nuclear tests, recorded a mysterious 1967 gamma-ray flash that didn’t fit terrestrial or solar sources, initiating gamma-ray burst research. Over time, improved timing allowed precise localization, establishing bursts as cosmic in origin. BeppoSAX’s 1997 afterglow localizations linked bursts to distant galaxies and revealed two main classes—short bursts from compact mergers and long bursts from collapsing massive stars—while extraordinary events like GRB 221009A in 2022 showed bursts can outshine almost all prior records, marking gamma-ray bursts as a central field in high-energy astrophysics.