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    Observations of cosmic gamma-ray bursts with IMP-7: Evidence for a single spectrum (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Spectral observation of nine recent cosmic gamma-ray bursts are reported. The average photon number spectra of all nine events are shown to be consistent with a 150-keV exponential from 100 keV to about 400 keV, and a power law of index -2.5 from 400 keV to 1100 keV. The observations also indicate an event rate of 16 in 1972 and 1973, or 8 + or - 2 per year, higher than the 5 + or - 1 per year initially reported. This corresponds to an approximately 40-percent lower effective intensity threshold, attained by using more sensitive detectors in multiple-satellite coincidence.
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-70778 , X-661-74-296
    Format: application/pdf
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