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  • SPACE RADIATION  (5)
  • 1990-1994  (2)
  • 1980-1984  (3)
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  • 1
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    Observation of gamma ray bursts and flares by the EGRET telescope on the Compton Gamma Ray Observatory (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory has observed energetic gamma ray bursts and flares. On May 3, 1991, EGRET detected a gamma ray burst both in the energy measuring NaI (Tl) scintillator and independently in the spark chamber imaging assembly. The NaI spectra were accumulated by a special BURST mode of EGRET. The spectra were measured over a range from 1 to 200 MeV, in three sequential spectra of 1,2, and 4 seconds. During the peak of the burst, six individual gamma rays were detected in the spark chamber, allowing a determination of the burst arrival direction. The intense flares of June were also detected. A solar flare on June 4 was observed to last for several minutes and for a brief time, less than a minute, had significant emission of gamma rays exceeding 150 MeV.
    Keywords: SPACE RADIATION
    Type: In: Gamma-ray bursts; Proceedings of the Workshop, Univ. of Alabama, Huntsville, Oct. 16-18, 1991 (A93-40051 16-93); p. 38-42.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Detection of high-energy gamma radiation from quasar 3C 279 by the EGRET telescope on the Compton Gamma Ray Observatory (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Intense gamma radiation has been observed from the direction of the quasar 3C 279 throughout the energy range from 30 MeV to over 5 GeV by the Energetic Gamma Ray Experiment Telescope (EGRET) during the period June 15-28, 1991. Its spectrum is well represented by a photon differential power-law exponent of 2.0 +/- 0.1, with a photon intensity above 100 MeV of (2.8 +/- 0.4) x 10 exp -6/sq cm s. For E is greater than 100 MeV, the 2-sigma upper limits were 1.0 x 10 exp -6/sq cm s in 1973 from the SAS 2 observations and 0.3 x 10 exp -6/sq cm s for the combined 1976, 1978, and 1980 COS B observations. Hence, there has been a large increase in high-energy gamma-ray intensity relative to the earlier times, as there has been in the radio, infrared, optical, and X-ray ranges. This source is the most distant and by far the most luminous gamma-ray source yet detected.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 385; L1-L4
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Searches for gamma ray emission from radio pulsars (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Searches were made for pulsed high energy (E greater than 35 MeV) gamma radiation from 43 pulsars using the SAS-2 data base and radio parameters. No positive results were found, and the upper limits are consistent with the concept that gamma ray production efficiency increases with increasing apparent age. Two limits suggest that efficiency cannot be a simple function of apparent age beyond 1,000,000 years. Previously announced in STAR as N83-24463
    Keywords: SPACE RADIATION
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 127; 1, Oc
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    NASA TECHNICAL REPORTS
  • 4
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    Extragalactic gamma radiation: Use of galaxy counts as a galactic tracer (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A derivation of the extragalactic diffuse gamma radiation with energies above 35 MeV was carried out using galaxy counts as a tracer of galactic matter. The extragalactic radiation has a differential photon number spectrum which may be expressed as a power law with index 2.35 (+0.4, -0.3) and an intensity above 35 MeV of (5.5 + or - 1.3) 0.00001 photons sq cm/s/ster, consistent with previous derivations. Use of a 1/sin of the absolute value of b expression of the galactic component produces a poorer fit, suggesting that the high-latitude galactic gamma-ray production may be dominated by cosmic ray interactions with matter rather than by Compton interactions of cosmic rays with photon fields.
    Keywords: SPACE RADIATION
    Type: NASA-TM-83901
    Format: application/pdf
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  • 5
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    Searches for gamma ray emission from radio pulsars (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Searches were made for pulsed high energy (E 35 MeV) gamma radiation from 43 pulsars using the SAS-2 data base and radio parameters. No positive results were found, and the upper limits are consistent with the concept that gamma ray production efficiency increases with increasing apparent age. Two limits suggest that efficiency cannot be a simple function of apparent age beyond 10,000,000 years.
    Keywords: SPACE RADIATION
    Type: NASA-TM-84970 , NAS 1.15:84970
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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