Table 2.
Number of joint GW+γ-ray detections for different combinations of γ-ray instruments.
| Instrument | Band | Flim | FOV/4π | Loc. acc. | Joint ET | NJD/Nγ | Joint (ET+CE) | NJD/Nγ |
|---|---|---|---|---|---|---|---|---|
| MeV | erg cm−2 s−1 | +γ-ray | +γ-ray | |||||
| Fermi-GBM | 0.01 – 25 | 0.5 (*) | 0.75 | 5 deg (a) |
 |
 |
 |
 |
| Swift-BAT | 0.015 – 0.15 | 2 × 10−8 | 0.11 | 1–3 arcmin |
 |
 |
 |
 |
| GECAM | 0.006 – 5 | 2 × 10−8 | 1.0 | 1 deg |
 |
 |
 |
 |
| SVOM-ECLAIRs | 0.004 – 0.250 | 1.792 (*) | 0.16 | < 10 arcmin |
 |
 |
 |
 |
| SVOM-GRM | 0.03 – 5 | 0.23 (*) | 0.16 | ∼5 deg |
 |
 |
 |
 |
| THESEUS-XGIS | 0.002 – 10 | 3 × 10−8 | 0.16 | < 15 arcmin |
 |
 |
 |
 |
| HERMES | 0.05 – 0.3 | 0.2 (*) | 1.0 | 1 deg |
 |
 |
 |
 |
| TAP-GTM | 0.01 – 1 | 1 (*) | 1.0 | 20 deg |
 |
 |
 |
 |
Notes. Columns (5) and (7) give the number of joint GW+γ-rays detections during one year of observation with ET alone, and the network of ET+CE, respectively. Columns (6) and (8) give NJD/Nγ, the fraction of γ-ray detections which have also a GW counterpart for ET and ET+CE, respectively. The jet structure Stru1 is assumed.
The value indicates the 50% percentile of the localization error of the fourth Fermi-GBM catalog (von Kienlin et al. 2020). 90% of the GRBs detected by Fermi have a localization error below 15 deg.
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