The spectra and light curves of two gamma-ray bursts

Details The spectra and light curves of two gamma-ray bursts The spectra and light curves of two gamma-ray bursts

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..75...21k&link_type=abstract

(Symposium on Cosmic Gamma-Ray Bursts, Toulouse, France, Nov. 26-29, 1979.) Astrophysics and Space Science, vol. 75, no. 1, Mar.

Astronomy and Astrophysics

Astronomy

4

Bursts, Gamma Ray Astronomy, Gamma Ray Spectra, Light Curve, Spaceborne Astronomy, Astronomical Models, Black Holes (Astronomy), Heao 1, Neutron Stars, Power Spectra, Stellar Mass Accretion, White Dwarf Stars

Scientific paper

Observations made by the Hard X-ray and Low Energy Gamma-Ray Experiment on board HEAO-1 of the spectra and light curves of two gamma-ray bursts for which localized arrival directions will become available are presented. The burst of October 20, 1977 is found to exhibit a fluence of 0.000031 + or - 0.000005 erg/sq cm over the energy range 0.135-2.05 MeV and a duration of 38.7 sec, while that of November 10, 1977 is found to have a fluence of 0.000021 + or - 0.000008 erg/sq cm between 0.125 and 3 MeV over 2.8 sec. The light curves of both bursts exhibit time fluctuations down to the limiting time resolution of the detectors. The spectrum of the October burst can be fit by a power law of index -1.93 + or -0.16, which is harder than any other gamma-burst spectrum yet reported. The spectrum of the second burst is softer (index -2.4 + or - 0.7), and is consistent with the upper index in the double power law fit to the burst of April 27, 1972.

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