Angular and redshift distributions of the GRB samples. a) The angular distribution of the GRB samples in J.2000 equatorial coordinates. The red solid dots represent the 244 GRBs at 0 < z < 2.5 detected by Swift, while the black solid dots represent those discovered by other detectors within the same redshift range. The red and black solid dots constitute Greiner’s GRB sample of 314 objects at 0 < z < 2.5. The blue circles represent the 112 GRBs (at 0 < z < 6.3) from SHOALS. b) The redshift distribution of the GRB data. The y-axis denotes the number of objects in each redshift bin. The green shaded area plus the purple area indicates the total of 314 GRBs from the Greiner sample. The dashed line represents the contribution from the SHOALS subsample of 75 objects at 0 < z < 2.5.