3-10 keV and 0. 1 to 2 MeV observations of four gamma-ray bursts

Journal Article · Sat May 26 04:00:00 EDT 1984 · AIP Conf. Proc.; (United States)

DOI:https://doi.org/10.1063/1.34544· OSTI ID:6238885

Laros, J G; Evans, W D; Fenimore, E E; Klebesadel, R W; Shulman, S; Fritz, G

Four catalogued ..gamma..-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/..gamma..-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 ..gamma.. burst with L/sub x//L/sub ..gamma../approx..02 (L/sub x/approx.10/sup 3 -/ ergs s/sup -1/, 3-10 keV, assuming a distance of 1 kpc). (2) The centroid of the X-ray emission generally lags the ..gamma..-ray centroid, but there is also evidence for one or more types of X-ray precursor activity. (3) The ..gamma..-ray hardness ratios were not highly variable for these particular events. However, there is some evidence that the ..gamma..-ray spectra softened near the ends of the bursts when the X-ray/..gamma..-ray ratios were high. (4) The X-ray/..gamma..-ray power law number index during times of the strongest ..gamma..-ray emission ranged from 0.8 to approx.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 ..gamma..-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 ..gamma..-ray emission.

• Research Organization: Los Alamos National Laboratory, Los Alamos, NM 87545
• OSTI ID: 6238885
• Journal Information: AIP Conf. Proc.; (United States), Journal Name: AIP Conf. Proc.; (United States) Vol. 115:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC GAMMA BURSTS
COSMIC RADIATION
COSMIC RAY SOURCES
COSMIC X-RAY BURSTS
COSMIC X-RAY SOURCES
DISTANCE
ELECTROMAGNETIC RADIATION
ENERGY RANGE
GAMMA SPECTRA
IONIZING RADIATIONS
KEV RANGE
KEV RANGE 01-10
LUMINOSITY
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PRIMARY COSMIC RADIATION
RADIATION FLUX
RADIATIONS
SPECTRA
X RADIATION
X-RAY SPECTRA