Hard X-ray spectra of cosmic gamma-ray bursts

Details Hard X-ray spectra of cosmic gamma-ray bursts Hard X-ray spectra of cosmic gamma-ray bursts

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..549k&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Oct. 15, 1977, p. 549-564. Navy-supported research;

Astronomy and Astrophysics

Astronomy

10

Bursts, Cosmic X Rays, Gamma Ray Astronomy, Spaceborne Astronomy, X Ray Spectra, Incidence, Ogo-5, Ogo-6, Radiation Detectors, Satellite-Borne Instruments, Spectral Energy Distribution, Time Dependence, Vela Satellites, X Ray Sources

Scientific paper

Hard X-ray measurements of six gamma-ray bursts observed during the period from October 1969 to April 1971 are presented. The measurements were made with detectors on the OGO-5 and OSO-6 satellites. Spectra for five of the six bursts have been determined using measurements from both satellites in order to reduce ambiguities due to uncertain source locations. A significant fraction, about 20-60%, of the energy of the bursts falls in the hard X-ray range (20-130 keV). The time-integrated spectra have been fitted by power-law, exponential, and thermal-bremsstrahlung functions. They are consistent with power laws which steepen at energies of at least 150 keV, as reported earlier for two other bursts. Evidence for spectral variability from event to event in the hard X-ray region is presented. For a power-law representation, the power-law index has values ranging from approximately unity to 2.5. The hard X-ray spectra of the gamma-ray bursts differ significantly from those of the recently discovered 1-15-keV X-ray bursts.

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