R-band and J-band points from the complete data set shown in Fig. 1, without shift in magnitude, to show the temporal evolution of the optical-NIR afterglow of GRB 080928. Optical r-band flux is nearly constant up to t − t₀ ~ 10⁻¹ days, before it decreases as expected for standard afterglows; NIR J-band observations show a similar decrease even if two points and only two upper limits were obtained.