Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92..651p&link_type=abstract
The Astrophysical Journal Supplement Series, vol. 92, no. 2, p. 651-653
Astronomy and Astrophysics
Astronomy
7
Gamma Ray Astronomy, Gamma Ray Bursts, Gamma Ray Spectra, Bremsstrahlung, Gamma Ray Absorption, Magnetic Fields, Pair Production, Photoproduction, Power Spectra
Scientific paper
The CsI anticoincidence shield of the SIGMA telescope aboard GRANAT has been operating for 3 years as a gamma-ray burst (GRB) detector in the 0.2-15 MeV range. Owing to a high-energy trigger threshold (250 keV), only 25 events have been detected and confirmed as cosmic GRBs. We present here a review of their spectral characteristics, in particular at high energies. The results of model fitting show that some spectra are more compatible with a broken power law than with a single-component law. Such high-energy breaks could be interpreted as photon absorption phenomena in the presence of a strong magnetic field.
Bouchet Laurent
Churazov Eugene
Claret Arnaud
Denisenko Denis
Diachkov A.
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