HEAO-1 observations of gamma-ray bursts

Details HEAO-1 observations of gamma-ray bursts HEAO-1 observations of gamma-ray bursts

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt.........3h&link_type=abstract

Ph.D. Thesis California Univ., San Diego.

Astronomy and Astrophysics

Astronomy

17

Astronomical Models, Gamma Ray Bursts, Neutron Stars, Spectrum Analysis, Stellar Evolution, Synchrotron Radiation, Absorption Spectra, Energy Spectra, Field Strength, Heao 1, Magnetic Fields

Scientific paper

The Hard X-Ray and low Energy Gamma Ray Experiment on the First High Energy Astronomical Observatory (HEAO-1), which operated from August, 1977 to January, 1979, detected 21 bursts above a limiting fluence sensitivity of 2 x 10 to the minus 7th ergs/sq cm. The measurement of spectral features confirms the neutron star origin for gamma-ray bursts. Limits on the source conditions derived from the line and continuum observations lead a description of burst emission near the surface of the star, while the higher energy emission, arises from pair annihilation outside the magnetosphere. After correctly modeling burst selection effects, the data showed no evidence for a deviation from uniformity in the distributions of burst fluence and positions.

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