Table 7.
Measurements of different parameters of GRBs for which molecular searches have been performed.
| GRB | Redshift | log(NH cm−2) | log(NH2 cm−2) | log(NCO cm−2) | log(f(H2)) | NCO/NH2 | [X/H] | [Zn/Fe] | AV (mag) |
|---|---|---|---|---|---|---|---|---|---|
| 050730 | 3.969 | 22.10 ± 0.10 | < 13.8 | – | < − 8.0 | – | −2.18 ± 0.11b | – | 0.10 ± 0.02 |
| 050820A | 2.615 | 21.05 ± 0.10 | < 14.1 | – | < − 6.7 | – | −0.39 ± 0.10 | 0.80 ± 0.03 | 0.07 ± 0.01 |
| 050922C | 2.200 | 21.55 ± 0.10 | < 14.6 | – | < − 6.7 | – | −1.82 ± 0.11a | – | < 0.03 |
| 060607A | 3.075 | 16.95 ± 0.03 | < 13.5 | – | < − 3.1 | – | – | – | < 0.24 |
| 071031 | 2.692 | 22.15 ± 0.05 | < 14.1 | – | < − 7.8 | – | −1.73 ± 0.05 | 0.04 ± 0.02 | 0.14 ± 0.13 |
| 080310 | 2.427 | 18.70 ± 0.10 | < 14.3 | – | < − 4.2 | – | ≤ − 1.91 ± 0.13b | – | 0.19 ± 0.05 |
| 080413A | 2.435 | 21.85 ± 0.15 | < 15.8 | – | < − 5.7 | – | −1.60 ± 0.16 | 0.13 ± 0.07 | < 0.51 |
| 080607 | 3.036 | 22.70 ± 0.15 | 21.2 ± 0.15 | 16.5 ± 0.3 | < 0.13(∼ − 1.2) | 2 × 10−5 | < − 0.2 | – | 3.3 ± 0.4 |
| 120327A | 2.813 | 22.01 ± 0.09 | 16.5 ± 1.2 | – | −5.2 ± 1.2 | – | −1.17 ± 0.11 | 0.56 ± 0.14 | < 0.03 |
| 120815A | 2.358 | 21.95 ± 0.10 | 20.54 ± 0.15 | – | −1.14 ± 0.15 | – | −1.15 ± 0.12 | 1.01 ± 0.10 | < 0.15 |
| 121024A | 2.302 | 21.88 ± 0.10 | 19.85 ± 0.15 | < 14.4 | −1.4 | < 3 × 10−6 | ∼ − 0.3 | 0.85 ± 0.04 | 0.09 ± 0.06 |
| 161023A | 2.710 | 20.97 ± 0.01 | < 15.2 | < 14.5 | < − 5.0 | – | −0.95 ± 0.05 | 0.7 ± 0.04 | 0.09 ± 0.03 |
Notes. The top part of the table shows events for which no H2 was detected (Ledoux et al. 2009). The second part of the table shows events for which there were successful H2 detections (Prochaska et al. 2009; D’Elia et al. 2014; Krühler et al. 2013; Friis et al. 2015). The metallicities are based on Zn, except for those marked with
which use S. Extinctions earlier than 2010 are obtained from Kann et al. (2010) and Perley et al. (2011) for the case of GRB 080607. At the bottom we also put the values for GRB 161023A with the mean metallicity derived in this work. The molecular fraction is defined as f(H2) = 2N(H2)/(2N(H2)+N(H)).
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