| Sat. | Tot. GRB | O.A.a | O. decayb | Tot. z spec.c | z from em. linesd |
| Swift | 122 | 62 | 44 | 41 | 6 |
| BeppoSAX | 39 | 18 | 16 | 12 | 3 |
| HETE2 | 44 | 17 | 15 | 14 | 2 |
| a GRB with Optical Afterglows; b GRB with multiple optical observations and estimated optical afterglow temporal decay index; c total number of GRBs with a reliable spectroscopic redshift; d GRBs with a redshift derived only through spectroscopy of the host galaxy. |