Fig. 6.
Comparison between the burst properties of all bursts observed with Swift (blue), the statistical sample that fullfill the criteria specified in Sect. 2.1 (green), and the subset that has been observed as part of the statistical sample (red). Left panel: fluence in the 15–150 keV band as observed by BAT. Middle panel: 0.3–10 keV flux, 11 h after the bursts as measured by XRT. Right panel: NHI, X based on the XRT spectrum (Evans et al. 2009).
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