Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..679h&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)679-(12)685
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Emission Spectra, Gamma Ray Astronomy, Gamma Ray Bursts, Neutron Stars, X Ray Spectra, Energy Spectra, Gamma Ray Observatory, Ginga Satellite, Heao 1, Light Curve, Satellite-Borne Instruments, Statistical Analysis, Very Large Array (Vla)
Scientific paper
The results obtained on cosmic gamma-ray bursts over the last several years are reviewed and compared with the older 'historical' results. Fine time resolution measurements of burster light curves continue to reveal structure at the millisecond and sub-millisecond level, suggesting a compact object origin. Similarly, the evolution of the low energy X-ray spectra of bursts towards shapes consistent with 1-2 keV blackbodies may be interpreted in terms of a neutron star origin, as can the continuing detection of absorption and emission features. The statistical evidence, however, argues strongly for an isotropic distribution which has been completely sampled. To reconcile this with galactic neutron stars requires the assumption that they are Population II objects. Counterpart searches have evolved to the point where they may be carried out within days of an event, and a soft X-ray source has now been detected in the error box of one recent burst.
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