Gamma-ray burst observations from HELIOS 2

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

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232l...1c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 232, Aug. 15, 1979, p. L1-L5.

Astronomy and Astrophysics

Astronomy

20

Gamma Ray Astronomy, Satellite Observation, Spaceborne Astronomy, X Ray Sources, Bursts, Data Reduction, Helios 2, X Ray Astronomy

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 arcmin, 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 class distinct from all lower-energy X-ray or higher energy gamma-ray emitters.

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