Table 1
Our sample of 22 GRB afterglows at z > 2 observed with X-shooter.
| GRB | Redshift | Instrumental resolution (FWHM) | S∕N | ||
|---|---|---|---|---|---|
| yymmdd# | (z) | UVB (km s−1) | VIS (km s−1) | NIR (km s−1) | |
| 090809A | 2.7373 | 50.8 | 29.4 | 44.8 | 3 |
| 090926A | 2.1069 | 49.1 | 28.4 | 42.2 | 14 |
| 100219A | 4.6676 | 48.7 | 28.7 | 46.9 | 3 |
| 111008A | 4.9910 | – | 22.7 | 38.5 | 5 |
| 111107A | 2.8930 | 49.3 | 20.6 | 40.5 | 4 |
| 120327A | 2.8143 | 47.9 | 29.0 | 41.0 | 15 |
| 120712A | 4.1719 | 53.2 | 34.5 | 55.6 | 2 |
| 120716A | 2.4874 | 56.1 | 33.0 | 48.9 | 4 |
| 120815A | 2.3582 | 48.6 | 26.8 | 48.4 | 6 |
| 120909A | 3.9290 | 60.1 | 32.0 | 55.6 | 11 |
| 121024A | 2.3005 | 50.2 | 24.6 | 38.0 | 5 |
| 130408A | 3.7579 | 50.6 | 22.9 | 38.5 | 12 |
| 130606A | 5.9127 | – | 24.2 | 46.2 | 15 |
| 140311A | 4.9550 | – | 28.5 | 40.4 | 3 |
| 141028A | 2.3333 | 51.2 | 30.6 | 44.7 | 4 |
| 141109A | 2.9940 | 51.7 | 29.9 | 44.9 | 9 |
| 150403A | 2.0571 | 51.9 | 29.9 | 44.9 | 6 |
| 151021A | 2.3297 | 52.7 | 28.3 | 46.9 | 3 |
| 151027B | 4.0650 | 54.3 | 31.2 | 47.3 | 8 |
| 160203A | 3.5187 | 51.5 | 23.1 | 38.5 | 14 |
| 161023A | 2.7100 | 50.7 | 29.3 | 44.0 | 16 |
| 170202A | 3.6456 | 46.9 | 27.3 | 40.0 | 9 |
| Excluded | Comment | ||||
| 100728B | 2.106 | Obs. T0 + 22.0 h | <2 | ||
| 110128A | 2.339 | Dark burst? high AV? | <2 | ||
| 120404A | 2.876 | Obs. T0 + 15.7 h, AV ~0.07 mag | <2 | ||
| 121201A | 3.385 | Obs. T0 + 12.0 h, AV ~0.17 mag | <2 | ||
| 121229A | 2.707 | Poor seeing | <2 | ||
| 130427B | 2.780 | Obs. T0 + 20.6 h, twilight | <2 | ||
| 130612A | 2.007 | Dark burst? high AV? | <2 | ||
| 131117A | 4.042 | AV < 0.20 mag, z > 4 | <2 | ||
| 140515A | 6.327 | Obs. T0 + 15.5 h, z > 6 | <2 | ||
| 140614A | 4.233 | AV < 0.50 mag, z > 4 | <2 | ||
| 161014A | 2.823 | Dark burst? anomalous extinction? | <2 | ||
Notes. Out of the 33 initially selected bursts, 11 were excluded because of poor S/N, which are additionally listed at the bottom of the table.Columns from left to right: name of the GRB; redshift; FWHM of the instrumental resolution in km s−1 inferred in the UVB, VIS, and NIR arms of X-shooter (taken from Selsing et al. 2019); S/N in the range of the expected H2 absorption lines. For the 11 bursts at the end of the table that were excluded from the sample, we write a small comment indicating the potential reason for the S/N being so low.
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