Table 5
Summary of the data for the six bursts with optical afterglow detection by GROND.
| GRB | α 1 | α 2 | tb [ks] | β opt | Θjet[deg] | Ecor [erg] |
|
|
||||||
| 081226A | 1.3 ± 0.2 | – | >10 | – | ≳2.6 | ≳ |
| 090305 | 0.56 ± 0.04 | 2.29 ± 0.60 | 6.6 ± 0.4 | 0.52 ± 0.15 | 2.2 ± 0.2 |
|
| 090426 | 0.46 ± 0.15 | 2.43 ± 0.19 | 34.5 ± 1.8 | 0.76 ± 0.14 | 6.5 ± 0.4 | 4.2 ± 1.4 × 1048 |
| 090510 | 1.13 ± 0.11 | 2.37 ± 0.29 | 1.6 ± 0.4 | 0.85 ± 0.05 | ~1 | ~3 × 1049 |
| 090927 | 1.32 ± 0.14 | – | >600 |
|
≳12 ± 2 | ≳ |
| 100117A | ~1.3 | – | >30 | – | ≳2.4 | ≳4.6 × 1048 |
Notes. GRB 090426: the light-curve parameters refer to the wide jet solution (see Paper I). GRB 090510: light-curve parameters of this burst are interpreted as a jet at very early times. α1 as well as tb were taken from the optical fit as reported in de Pasquale et al. (2010d); Θjet and Ecor were taken from He et al. (2011). For the other bursts, see this work. GRB 090927: constraints on the jet break time come from the X-ray data (Fig. 6). The results refer to a wind model.
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