Transient emission of ultra-high energy pulsed gamma rays from Crab pulsar PSR0531

Astronomy and Astrophysics – Astronomy

Scientific paper

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Crab Nebula, Gamma Ray Astronomy, Gamma Ray Bursts, Pulsars, Cosmic Rays, Energetic Particles, Light Curve, Pulsed Radiation

Scientific paper

Results are reported of a study of ultra-high energy (energy greater than 2000 GeV) gamma ray emission from the Crab pulsar PSR 0531. Observations were made over 34 hours between September 25 and November 2, 1981 by a four-telescope array designed to detect Cerenkov emission from electron showers produced by cosmic gamma rays or particles. The observations show overall an integral pulsed flux and provide strong evidence for a burst of pulsed emission of about 15 min duration. Results are in agreement with a time-averaged flux near 10 to the 11th/sq cm per sec, and account for a previously noted lack of reproducibility in ultra-high energy gamma ray flux measurements from the Crab pulsar.

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