{
  "id": 9785407,
  "title": "A Brief History of the Discovery of Cosmic Gamma-Ray Bursts",
  "url": "https://urgent.news/2026/09/25/a-brief-history-of-the-discovery-of-cosmic-gamma-ray-bursts",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-25T15:10:02.000Z",
  "source": {
    "name": "NASA Science",
    "slug": "nasa-science",
    "url": "https://science.nasa.gov/apod/a-brief-history-of-the-discovery-of-cosmic-gamma-ray-bursts/"
  },
  "original_language": "en",
  "account": "In October of 1963, the United States Air Force launched the first in a series of satellites designated as Vela, inspired by a recently signed nuclear test ban treaty. These satellites, part of an unclassified research and development program, aimed to monitor nuclear tests from space, providing a means to verify adherence to the treaty. Vela satellites were launched in pairs, orbiting at a diameter of 250,000 kilometers, ensuring continuous observation of Earth. Equipped with x-ray, gamma-ray, neutron, optical, EMP, and space environment instruments, the Vela satellites were designed and built by teams at Los Alamos Scientific Laboratory and Sandia Laboratories. The primary purpose of the gamma-ray detectors was to confirm nuclear detonations by detecting the resulting hard gamma-radiation. The Vela satellites generally performed well and exceeded their expected operational lifetimes, with successive launches improving their capabilities. In 1969, Ray Klebesadel of Los Alamos Scientific Laboratory took charge of the x-ray and gamma-ray instruments. He carefully filed away events that triggered the detectors but were clearly not nuclear detonations for future study. In 1972, Ian Strong, also at Los Alamos, examined Klebesadel's files and identified these gamma-ray events as originating from cosmic sources, ruling out the sun and Earth as possible sources. This discovery was announced in Ap.J. letters in 1973, with additional confirmation from Tom Cline and Upendra Desai of NASA/GSFC using an x-ray detector on board IMP-6. In 1967, Klebesadel and Olsen found an event recorded by Vela 4a,b on July 2, 1967, which triggered later Vela satellites. Believing this event to be the \"first observed gamma-ray burst,\" Klebesadel later constructed a time history of the event, published in Scientific American in October 1976. No earlier observation of a similar event is known, and the discovery of cosmic gamma-ray bursts sparked significant interest in the astronomical community, leading to a surge of publications on the subject.",
  "summary": "Draft April 17, 1995 – J.Bonnell In October of 1963 the US Air Force launched the first in a series of satellites inspired by a recently signed nuclear test ban treaty. Signatories of this treaty agreed not to test nuclear devices in the atmosphere or in space. These “Vela” (from the Spanish verb velar, to […] The post A Brief History of the Discovery of Cosmic Gamma-Ray Bursts appeared first on…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}