Fig. 6

The X-ray luminosity of 190 Swift GRBs and their afterglows in the range of 0.3 to 10 keV between Jan. 26, 2005, and Apr. 25, 2010. GRB 080928 is shown in black. For comparison all six GRBs within a redshift interval of 0.1 around the redshift of GRB 080928 are highlighted in dark gray. The luminosity of the afterglow of GRB 080928 was basically in the mean of the X-ray luminosities that have so far been observed.
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