Example figure of ρ_LGRB(z) in 1 + z space. The orange-filled circles represent the ρ_OS taken from K25. The red-filled and blue-filled circles represent ρ_PS and ρ_CS, respectively. The black solid curve is ρ_theor derived from Equation (6) and multiplied with (1 + z)^δ. We choose δ = 1.6 as an example for this figure. The interactive figure is available in the online version of the journal, which contains a slider that allows δ to change, thus accounting for the evolution of GRB/progenitor properties. Standard controls, i.e., panning, zooming, and autoscale, are available via the button in the upper-right corner of the interactive figure.

An interactive version of this figure is available in the online article.

An interactive version of this figure is available.

An interactive version of this figure is available in the online journal.