Fig. 2
Afterglow spectral energy distribution. The red spectrum is the X-Shooter spectrum, the filled circles on the left are the GROND photometric points (Afonso et al. 2013), and the data points on the right are the (binned) Swift/XRT points. The solid line is the synchrotron spectrum with interstellar absorption, while the dashed line shows the unabsorbed synchrotron spectrum with best fit β = 1.02.
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