Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.256..347f&link_type=abstract
Nature, vol. 256, July 24, 1975, p. 347, 348; Reply, p. 348. Research supported by the Science Research Council and ERDA.
Astronomy and Astrophysics
Astronomy
4
Astronomical Models, Galactic Radiation, Gamma Rays, Spaceborne Astronomy, Time Response, Radiation Measurement, Satellite-Borne Instruments, Vela Satellites
Scientific paper
A critical review of the Strong and Klebesadel (1974) work which suggested that most of the 23 gamma ray bursts detected by the Vela satellites are of galactic origin, is presented together with their reply. It is argued that number counts of gamma ray bursts, or any other transient phenomena, of time-integrated fluxes may merely reflect the average time structure of the events rather than inhomogeneities in source distribution. It is also suggested that many more observations over a wider range of sensitivity are required if source distances are to be inferred from the number counts. The reply defends the original work; Strong and Klebesadel disagree with the criticism's two principal assumptions. These are: (1) the flux as a function of time may be represented adequately by a form having an abrupt rise to maximum followed by exponential decay, and (2) the apparent duration of the bursts is limited by the detector noise level.
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