Physical parameters of GRB 970508 from its afterglow synchrotron emission

Details Physical parameters of GRB 970508 from its afterglow synchrotron emission Physical parameters of GRB 970508 from its afterglow synchrotron emission

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..451g&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.451-452

Astronomy and Astrophysics

Astrophysics

5

Gamma-Rays: Bursts, Radiation Mechanisms: Non-Thermal

Scientific paper

For the case of an adiabatically expanding blast wave, which is applicable to observed gamma-ray burst (GRB) afterglows at late times, we give expressions to infer the physical properties of the afterglow from the measured spectral features. We show that enough data exist for GRB 970508 to compute unambiguously the ambient density, n=0.03 cm(-3) , and the blast wave energy per unit solid angle, {cal E}=4\ 10(52) erg/4pi sr. We also compute the energy density in electrons and magnetic field. We find that they are 12% and 9%, respectively, of the nucleon energy density.

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