The 1.4 GHz light curve of GRB 970508

Abstract

We report on Westerbork 1.4 GHz radio observations of the radio counterpart to $\gamma$-ray burst GRB~970508, between 0.80 and 138 days after this event. The 1.4 GHz light curve shows a transition from optically thick to thin emission between 39 and 54 days after the event. We derive the slope $p$ of the spectrum of injected electrons ($dN/d{\gamma }_e\propto {\gamma }_e^{-p}$) in two independent ways which yield values very close to $p=2.2$. This is in agreement with a relativistic dynamically near-adiabatic blast wave model whose emission is dominated by synchrotron radiation and in which a significant fraction of the electrons cool fast.

Paper I. Accepted for publication in the Astrophysical Journal Letters

References in corpus (12)

• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
• Shocked by GRB 970228: the afterglow of a cosmological fireball
• The optical counterpart to gamma-ray burst GRB970228 observed using the Hubble Space Telescope
• Implications of the radio afterglow from the gamma-ray burst of May 8, 1997
• Radio scintillation of gamma-ray-burst afterglows
• The radio to X-ray spectrum of GRB 970508 on May 21.0 UT
• Optical follow-up of GRB 970508
• Evidence for Diverse Optical Emission from Gamma-Ray Burst Sources
• The decay of optical emission from the Gamma-Ray Burst GRB 970228
• Radio Monitoring of the January 11, 1997 Gamma-Ray Burst
• Radio and Optical Follow-up Observations and Improved IPN Position of GRB 970111

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