Gamma-ray burst observations from Helios-2

Details Gamma-ray burst observations from Helios-2 Gamma-ray burst observations from Helios-2

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979stin...7928115c&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Bursts, Gamma Rays, Helios 2, Interplanetary Space, Radiation Sources, Astrophysics, Cosmic Rays, Data Reduction, Gamma Ray Spectra, Radiation Detectors, Vela Satellites

Scientific paper

Observations of five gamma-ray bursts made with the solar orbiter Helios-2 are reported. Wavefront timing from Helios-2, at distances of up to 1.98 AU, to Vela-5A and -6A, in Earth orbit, provides source location bands as narrow as 2 arc minutes, although several degrees in length. The burst intensities and time profiles measured in interplanetary space by Helios-2 are the same as those observed near the earth, ruling out a narrow-beam interplanetary origin model. Also, the source direction bands for these events are inconsistent with the directions of all known celestial X-ray objects, X-ray bursters and high-energy gamma-ray source regions. The gamma-ray burst source objects therefore appear to form a distinct class from all lower energy X-ray or higher energy gamma ray emitters.

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