Physical Constraints on GRB 970508 From Its Radio Afterglow

Details Physical Constraints on GRB 970508 From Its Radio Afterglow Physical Constraints on GRB 970508 From Its Radio Afterglow

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...496l..67b&link_type=abstract

Astrophysical Journal Letters v.496, p.L67

Astronomy and Astrophysics

Astronomy

5

Gamma Rays: Bursts

Scientific paper

Model-independent lower limits on the energy stored in the electrons emitting the radio afterglow from GRB 970508 are derived. These limits arise from the optically thick synchrotron source function and the synchrotron cooling timescale. The primary free parameters for these limits are the dimensionless synchrotron frequency, the bulk Lorentz factor Gamma , and the source diameter theta . When one assumes theta is related to Gamma alone, one finds that the energy stored in electrons is more than 1051 ergs for a 3 mu as source size and more than 1049 ergs for a 6 mu as source size. These limits are inconsistent with the energy storage expected for a relativistic shell from a destructive solar mass source.

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