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  • 1
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    Simultaneous observations of gamma-ray bursts with Phebus/Granat and Ulysses GRB (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We compare the characteristics of 35 gamma-ray bursts (GRBs) detected simultaneously by Phebus aboard Granat and the Ulysses GRB experiment. Phebus observes a medium to high energy range (100 keV - 100 MeV), while the Ulysses GRB detector is sensitive to lower energy photons (25 - 150 keV). Comparison of the peak counts recorded by these two instruments shows that the variation in burst intensities is more extended for Phebus (above approximately 150 keV) than for Ulysses GRB. This result confirms similar observations from other instruments (Atteia et al. 1991; Mitrofanov et al. 1992; Belli 1992). We discuss the consequences of this behavior for the statistical properties of GRBs, and for the searches for a possible cosmological redshift.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 288; 1; p. 213-218
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    NASA TECHNICAL REPORTS
  • 2
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    The optical and X-ray content of the 1992 May 1 gamma-ray burst error box (1994)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A gamma-ray burst which occurred on 1992 May 1 was observed by three spacecraft in the third interplanetary network, and rapidly localized to a small error box. The coordinates were promptly circulated to a wide astronomical community, and radio, optical, and X-ray counterpart searches were carried out. A weak X-ray source was found in the error box, and two radio sources are discovered outside the error box, but in alignment with the X-ray source. The X-ray source position contains approximately 25 optical objects down to 23d magnitude. We discuss the prospects for identifying the burster counterpart.
    Keywords: ASTRONOMY
    Type: The Astrophysical Journal Supplement Series (ISSN 0067-0049); 92; 2; p. 655-657
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    NASA TECHNICAL REPORTS
  • 3
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    Upper limits to Jovian hard X radiation from the Ulysses gamma ray burst experiment (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: We describe the first in situ search for Jovian X radiation with a dedicated X ray instrument. Upper limits to Jupiter's X ray power in the 27 - 48 keV range are presented using data taken by the gamma ray burst experiment on the experiment on the inbound Ulysses trajectory, at distances between 163 and 110 R(sub J). The data were analyzed using three methods for detection of (1) a steady flux, (2) a flux linked to System III rotation, and (3) a sporadic flux. The 3 sigma upper limits lie between 1.1 x 10(exp 8) and 5.6 x 10(exp 8) W. The results are consistent with the idea that the bulk of the Jovian UV auroral emissions are due to energetic electrons, while the previously observed low-energy X radiation is due to ion precipitation.
    Keywords: ASTRONOMY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A12; p. 21,217-21,219
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    NASA TECHNICAL REPORTS
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