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Paper: Five Years of Multi-frequency Monitoring of GRB030329 Afterglow Using the GMRT and WSRT
Volume: 407, The Low-Frequency Radio Universe
Page: 295
Authors: Kamble, A.; van der Horst, A.J.; Bhattacharya, D.; Wijers,R.; Ishwara-Chandra, C.H.; Resmi, L.; Rol, E.; Kouveliotou, C.; Strom, R.
Abstract: GRB 030329 displayed one of the brightest optical afterglows ever. We have followed the radio afterglow of GRB 030329 for over 5 years using the GMRT and WSRT at low radio frequencies. This is the longest as well as the lowest frequency follow up of any GRB afterglow ever. Radio observations of a GRB afterglow provide a unique probe of the physics of the blast wave at late times, when the expansion of the fireball slows down to non-relativistic speeds. Our GMRT-WSRT observations suggest that the afterglow of GRB030329 entered the non-relativistic phase around 60 days after the burst. The estimate of the fireball energy content, ~ 1051 erg, in this near-isotropic phase is much less susceptible to the collimation-related uncertainties arising in the relativistic phase. We have also been closely monitoring the evolution of the afterglow to look for possible signatures of emission from a counter jet, but no conclusive evidence has so far been found.
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