Table 1.
Characteristics describing one single HERMES module.
| Detection | FoV | Energy range | Back. rate | Effective | |
|---|---|---|---|---|---|
| mode | sr | keV | counts/s | area | |
| HP | X | 3.14 | 3–20 | 352 | Nominal (Fig. 1) |
| S | 5.20 | 50–500 | 80 | Nominal (Fig. 1) | |
| Const. A | X | 3.14 | 3–20 | 1408 | Nominal × 4 |
| S | 5.20 | 50–500 | 320 | Nominal × 4 | |
| Const. B | X | 1.57 | 3–20 | 704 | Nominal × 4 |
| S | 2.60 | 50–500 | 160 | Nominal × 4 | |
Notes. For the HP module and the two different configurations of the Constellation (A and B) and for each detection mode (X and S), the table reports the FoV of a single unit, defined as the field corresponding to 20% of the on-axis collecting area at 100 keV, the energy range considered for the computation of GRB detection rates, the expected background count rate in the same energy range, and the effective area. For the expected background and the effective areas, see also Campana et al. (2020, 2022).
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