Parameter space in the n − ϵ_B plane with color indicating the observed flux F_ν. The lower left part of each panel is the allowed parameter space from the nondetection of radio emission from GRB 080905A. The left panel is the constraints based on our model, and the right panel is the constraints based on Fong et al. (2016). The light gray vertical region is the range of the allowed circumburst medium density independently determined from the broadband afterglow modeling.