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Fig. 1

image

Location in the Ep,iEiso plane of GRB 161219B as observed by Swift-BAT and Konus-WIND and of GRB 060218 as observed by Swift-BAT and by Swift-BAT+XRT. Swift-BAT is more sensitive than Konus-WIND, thus allowing a more precise estimate of the Ep,i and Eiso parameters for GRB 161219B and finding it more consistent with the Amati relation. In the outstanding case of GRB 060218, the emission in the soft X-ray band, which can only be detected by using Swift-XRT, makes this event, which otherwise would have been classified as an outlier, fully consistent with the Ep,iEiso correlation. In the plot, the dot-dashed (dotted) lines refer to the 2 (3) sigma error around the best-fit line.

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