Author: Alexander van der Horst
Abstract: Radio observations provide a unique way to probe the fastest ejecta in GRB outflows and their direct environment. The radio regime not only compliments the coverage of the broadband GRB afterglow spectrum, but is also crucial in tracing the GRB evolution until very late times, and has enabled direct and indirect source size measurements. The sample of GRBs bright enough for detailed studies at radio wavelengths is currently limited, but this situation is changing now in a new era of radio astronomy. All major radio observatories in the world have recently been upgraded or are being upgraded soon, and several new facilities are being built. I will discuss the new capabilities of these facilities, how they will increase the sample of radio detected GRBs, and how they will probe unexplored parameter space by means of automated triggering and/or observing down to tens of megahertz.