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Fig. 6.
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Evolution of NIR-X-ray spectral index as a function of X-ray spectral index for GRB 150309A (presented with a red square). We also show the βOX − βX data points for other well-studied samples of Swift GRBs Melandri et al. (2012), Littlejohns et al. (2015) for comparison. The horizontal dashed black line shows the βOX = 0.5.
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