Table 1.
Average values of the spectral parameters for the different types of fits.
| SPL | DPL | DPL | DPL | KK | AK | AK | AK | |
|---|---|---|---|---|---|---|---|---|
| STEP + EPT | EPT only | All | STEP + EPT | EPT only | All | |||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | |
| No. of events (%) | 3 (6.8%) | 4 (9.1%) | 9 (20.5%) | 3 (29.5%) | 10 (22.7%) | 15 (34.1%) | 3 (6.8%) | 18 (40.9%) |
| Ebl [keV] | – | 74.3 ± 1.6 | 65.0 ± 4.0 | 67.8 ± 1.7 | 28.8 ± 0.5 | 30.9 ± 1.7 | 73.9 ± 20.9 | 38.0 ± 6.8 |
| Ebh [keV] | – | – | – | – | 100.6 ± 1.6 | 60.1 ± 4.4 | 103.8 ± 2.7 | 67.4 ± 3.1 |
| γ1 | –2.43 ± 0.01 | –1.52 ± 0.01 | –2.40 ± 0.44 | –2.13 ± 0.10 | –2.29 ± 0.07 | –6.45 ± 1.04 | –5.12 ± 0.50 | –6.23 ± 0.73 |
| γ2 | – | –4.56 ± 0.07 | –4.62 ± 0.10 | –4.60 ± 0.06 | –3.00 ± 0.03 | –0.14 ± 1.43 | –0.18 ± 0.91 | –0.15 ± 1.02 |
| γ3 | – | – | – | – | –4.29 ± 0.05 | –4.96 ± 0.35 | –4.02 ± 0.66 | –4.81 ± 0.32 |
Notes. This table summarises the average values of the spectral break energies and spectral indices (γ1, γ2 and γ3). In the case of triple power law fits, Ebl denotes the lower-energy spectral break, and Ebh is the higher-energy spectral break. We make two important distinctions: (1) we separate the two types of triple power laws into those progressively becoming softer (KK) and those or with a spectral hardening after the first break (AK), and (2) we make a distinction between events that extend through the energy range of both STEP and EPT and the ones that are only seen in the EPT energy range. The single power laws were all analysed with a combination of STEP and EPT, so we do not mark them separately. One KK triple power law is measured only in the EPT range, but the spectral indices and breaks are within error bars of the average values of the ones measured by STEP and EPT together so we do not separate the single event from the others. The uncertainties of the average values are determined with the error propagation of a mean. Abbreviations: SPL (single power law), DPL (double power law), KK (KK triple power law), AK (AK triple power law).
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