HEAO-1 observations of gamma-ray bursts
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/sup -7/ ergs/cm/sup 2/. The measurement of spectral features confirms the neutron-star origin for gamma-ray bursts. An emission line at 428 +/- 52 keV and an absorption line at 66 +/- 7 keV were measured in the spectrum of a burst on June 8, 1978. On March 25, 1978, the absorption line shifted from 76 +/- 5 keV to 49 +/- 3 keV from one emission peak to another, the first time that this effect has been observed. Measurements of both line and continuum variation demonstrate that these features are not artifacts of temporal averaging or spectral superposition. Limits on the source conditions derived from the line and continuum observations lead to a description of burst emission in which the
- Research Organization:
- California Univ., San Diego (USA)
- OSTI ID:
- 7059271
- Country of Publication:
- United States
- Language:
- English
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640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ANNIHILATION
BASIC INTERACTIONS
BREMSSTRAHLUNG
COSMIC GAMMA BURSTS
COSMIC RADIATION
DETECTION
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY RANGE
INTERACTIONS
IONIZING RADIATIONS
KEV RANGE
KEV RANGE 10-100
KEV RANGE 100-1000
NEUTRON STARS
PRIMARY COSMIC RADIATION
RADIATIONS
SPECTRA
STARS
SYNCHROTRON RADIATION