Table 2.
Minimum O VII observed equivalent width that can be detected at 90%, 50%, and 20% detection probabilities for different GRB afterglow starting fluxes during a 50 ks observation.
| Fstart, 0.3−10 keV | F0.3−10 keV | EW90% | EW50% | EW20% |
|---|---|---|---|---|
| [erg cm−2 s−1] | [erg cm−2 s−1] | [eV] | [eV] | [eV] |
| 1 × 10−10 | 3.3 × 10−11 | 0.17 | 0.10 | <0.07 |
| 5 × 10−11 | 1.7 × 10−11 | 0.20 | 0.14 | 0.09 |
| 1 × 10−11 | 3.3 × 10−12 | >0.42 | 0.33 | 0.23 |
| 5 × 10−12 | 1.7 × 10−12 | >0.42 | >0.42 | 0.34 |
| 1 × 10−12 | 3.3 × 10−13 | >0.42 | >0.42 | >0.42 |
Notes. Column 1: simulated starting flux (erg cm−2 s−1) of the GRB afterglow four hours after the outburst began; Col. 2: 0.3−10 keV average absorbed flux (erg cm−2 s−1) during a 50 ks observation of a GRB afterglow with the X-IFU; Col. 3: minimum observed equivalent width (eV) of O VII with a 90% probability of detection at a minimum significance of 90% by the X-IFU; Col. 4: minimum observed equivalent width (eV) of O VII with a 50% probability of detection at a minimum significance of 90% by the X-IFU; Col. 5: minimum observed equivalent width (eV) of O VII with a 20% probability of detection at a minimum significance of 90% by the X-IFU.
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