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- W1625683324 abstract "Four catalogued γ‐ray bursts that occurred between 79/3/7 and 79/7/31 have been observed over the 3‐10 keV range by a joint NRL/Los Alamos experiment on the Air Force P78‐1 satellite. The bursts were also well observed by members of the interplanetary network. In this paper we present hardness ratios, X‐ray/γ‐ray luminosity ratios, and time histories. The most significant results presented herein can be summarized as follows: (1) Gamma‐ray bursters can emit fairly strongly at X‐ray energies near the time of the γ burst with Lx/Lγ∼.02 (Lx∼103− ergs s−1, 3‐10 keV, assuming a distance of 1 kpc). (2) The centroid of the X‐ray emission generally lags the γ‐ray centroid, but there is also evidence for one or more types of X‐ray precursor activity. (3) The γ‐ray hardness ratios were not highly variable for these particular events. However, there is some evidence that the γ‐ray spectra softened near the ends of the bursts when the X‐ray/γ‐ray ratios were high. (4) The X‐ray/γ‐ray power law number index during times of the strongest γ‐ray emission ranged from 0.8 to ∼1.1 for the four bursts. (5) The X‐ray tail of GB790307 probably can be modeled as the cooling of hot plasma generated during the γ‐ray burst. Simple versions of this model can be used to estimate various source parameters. These estimates imply a distance of a few hundred to a few thousand pc. (6) Gamma‐ray bursters probably do not produce events similar to ‘‘classical’’ X‐ray bursts independently of the γ‐ray emission." @default.
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- W1625683324 date "1984-01-01" @default.
- W1625683324 modified "2023-10-17" @default.
- W1625683324 title "3-10 keV and 0.1 to 2 MeV observations of four gamma-ray bursts" @default.
- W1625683324 doi "https://doi.org/10.1063/1.34544" @default.
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