The distance and spectrum of the Apollo gamma-ray burst

Details The distance and spectrum of the Apollo gamma-ray burst The distance and spectrum of the Apollo gamma-ray burst

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..951g&link_type=abstract

Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 951-957.

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36

Apollo 16 Flight, Emission Spectra, Gamma Ray Spectra, X Ray Sources, Bremsstrahlung, Frequency Distribution, Particle Energy, Photons, Telemetry, X Ray Spectroscopy

Scientific paper

The gamma-ray spectrometer on Apollo 16 obtained spectral information with good energy resolution from more than 2500 burst photons in the energy range 0.06-5.16 MeV. The spectrum from 1 keV to 2 MeV, observed at X-ray energies by the Apollo X-ray spectrometer, is fitted by a thermal bremsstrahlung spectrum with kT = 500 keV. The success of the fit implies that the source is optically thin, and it follows that it must be closer than 50 pc. Absence of spectral variability suggests that the burst results from isothermal changes in emission measure.

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