Injection frequency at the tp for each GRB. The optical-R frequency is show by the horizontal line. The injection frequency is shown for the homogeneous and wind case with red and blue symbols. GRBs with tp from the LAT light curve are shown with star symbols. The scaling t− 3/2 of the injection frequency is shown for reference (it is not a fit) by the dashed line. Vertical bars, shown only for the red symbols, represent the position of the injection frequency obtained assuming ϵB in the range 10-4−10-1.
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