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  • SPACE RADIATION  (3)
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  • 1
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    Very high-energy gamma ray astronomy (1977)
    In:  CASI
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    Publication Date: 2006-08-09
    Description: Recent results in ground-based very high-energy (less than 10 to the eleventh power eV) gamma-ray astronomy are reviewed. The various modes of the atmospheric Cerenkov technique are described, and the importance of cosmic ray rejection methods is stressed. The positive detections (at approximately less than 10 to the 12th power eV) of the Crab pulsar that suggest a very flat spectrum and time-variable pulse phase are discussed. Observations of other pulsars (particularly Vela) suggest that these features may be general. The steady flux upper limits for the Crab Nebula are thus reconsidered, and a new value of the implied (Compton-synchrotron) magnetic field in the Nebula is reported. Evidence that a 4.8-hour modulated effect was detected at E sub gamma is less than 10 to the 12th power eV from Cyg X-3 is strengthened in that the exact period originally proposed agrees well with a recent determination of the X-ray period. The southern sky observations are reviewed, and the significance of the detection of an active galaxy (NGC 5128) is considered for source models and future observations.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center The Struct. and Content of the Galaxy and Galactic Gamma Rays; p 81-98
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Search for optical emission from cosmic gamma-ray bursts (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Long-exposure films are available for both times and regions of sky for several cosmic gamma-ray bursts. A visual magnitude of no more than 6 was set for optical emission from the well-observed May 14, 1972, event. The corresponding lower limit for the ratio of X-ray to optical energy flux in the burst is greater than 100. This may restrict solar-flare analogy models for the burst sources.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 192; Sept. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Search for high frequency pulsations in the onset of the March 5 gamma-ray burst (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The onset of the March 5 Gamma-Ray burst was observed with microsecond time resolution by the Monitor Proportional Counter aboard the HEAO-2/Einstein Observatory. The data were analyzed for high frequency periodic pulsations which, if present, would be strong evidence for vibrations of a neutron star following the initial release of energy. Evidence is not found for such pulsations in the data over the period range 29.4737 to 0.0962 ms, and upper limits to the amplitude of 49-70% are set.
    Keywords: SPACE RADIATION
    Type: Astrophysical Letters; 22; 2, 19; 1981
    Format: text
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    NASA TECHNICAL REPORTS
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