Mathematics – Logic
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may..c504m&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #C5.04
Mathematics
Logic
Scientific paper
Gamma-ray bursts are brief, intense flashes of gamma-rays from unknown celestial sources. They occur at a rate of about one per day, last from about 0.1 to 1000 seconds, and have not been detected at wavelengths longer than X-ray. The angular distribution is isotropic, but the intensity distribution indicates that the density of sources decreases with distance. No known galactic component has such a distribution, leading to a resurgence of the hypothesis that the burst sources are at cosmological distances. Observational evidence favoring the cosmological hypothesis includes the possible detection of time dilation and redshift. On the other hand, cyclotron absorption lines and repeating sources have also been reported, favoring a galactic origin. The current observational status of gamma-ray bursts will be reviewed, with particular emphasis on the observations relevant to the burster distance scale.
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