The power-law spectral index in the Swift XRT energy band (0.3–10keV) is plotted versus the slope in the Fermi-LAT γ-ray band (100MeV–100GeV) derived using Fermi-LAT data integrated over a period of 2 months. The same plot built with simultaneous γ-ray data is shown in the inset at the upper right. A clear anti-correlation is present; the Spearman test gives a probability of less than 0.01% that the correlation is due to chance, even in the simultaneous data.
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