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  • 1
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    The hard X-ray pulse profile of the transient source A0535+26 (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Measurements of the 104 sec pulse profile of A0535+26 at energies near 50 keV are reported. The data were obtained with a balloon-borne detector system which was launched on May 22, 1975 with the objective to observe transient or periodic emissions from X-ray or gamma-ray sources. The presence of the source was detected by a superposed epoch analysis. The pulse profile of A0535+26 in two energy channels is presented in a graph.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 212
    Format: text
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  • 2
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    Galactic distribution models of gamma-ray burst sources (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The log N-log S relationships for several galactic distribution models of gamma-ray burst sources are derived. The resulting curves are substantially different from the galactic curves usually assumed (slope = -1). There is a relatively weak dependence on the radial distribution assumed but a strong dependence on scale height. Available observational data from several experiments appear to rule out both thin disk distributions and extended halo distributions which have a strong radial density dependence. The prospects are good for obtaining self-consistent distribution data from future large-area detectors.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Observations of Cygnus X-3 above 50 keV (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Cygnus X-3 was observed in the energy range 50-400 keV using a balloon-borne, actively collimated, NaI(Tl) scintillation detector. The observation was made from phase 0.45-0.91 of the 4.8 hour period. The photon number spectrum was well represented by a power law with index -2.2. The flux increased throughout the observation, consistent with a highly asymmetric light curve with a peak near phase 0.9.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 234
    Format: text
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    NASA TECHNICAL REPORTS
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