3-10 keV and 0.1 to 2 MeV observations of four gamma-ray bursts

Details 3-10 keV and 0.1 to 2 MeV observations of four gamma-ray bursts 3-10 keV and 0.1 to 2 MeV observations of four gamma-ray bursts

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aipc..115..378l&link_type=abstract

AIP Conference Proceedings, Volume 115, pp. 378-389 (1984).

Physics

7

X-Ray Sources, X-Ray Bursts, X-Ray

Scientific paper

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.

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