Fig. 3
SED of GRB 130528A afterglow at 1.33 days. A model is overplotted with the observed data, assuming νa = 1.1 × 109 Hz, νm = 1.1 × 1012, νc = 6 × 1016, Fνmax = 700 μJy, p = 2.2, and a smoothing parameter s = 3 in the case of the interstellar medium model νa<νm<νc. The red arrows represent observed flux in the radio and X-ray at 1.33 days. The blue arrow shows the I-band upper limit observed by 1.5 m OSN at a similar epoch. The low upper limit can be explained by a significant extinction in the line-of-sight.
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