Table 4.
p value from the KS test of the Swift/XRT light-curve parameters.
| Parameter | p value observed | p value detected at VHE | p value detected at VHE (except GRB 190829A) |
|---|---|---|---|
| vs. whole population | vs. whole population | vs. whole population | |
| Fluence during observations | N/A | 6.5 × 10−5 (4.0σ) | 4.6 × 10−5 (4.1σ) |
| excluding GRB 221009A | |||
| Flux at 200 s | 0.91 (0.1σ) | 1.9 × 10−3 (3.1σ) | 1.0 × 10−5 (4.4σ) |
| Flux at 1 h | 0.89 (0.1σ) | 1.3 × 10−6 (4.0σ) | 6.6 × 10−6 (4.5σ) |
| Flux at 11 h | 0.92 (0.1σ) | 9.7 × 10−6 (4.8σ) | 1.1 × 10−4 (3.8σ) |
| Flux at 24 h | 0.91 (0.1σ) | 3.7 × 10−5 (4.1σ) | 3.2 × 10−4 (3.6σ) |
| Spectral index at 200 s | 0.97 (0.04σ) | 0.60 (0.5σ) | 0.26 (1.1σ) |
| Spectral index at 1 h | 0.48 (0.7σ) | 0.68 (0.4σ) | 0.31 (1.0σ) |
| Spectral index at 11 h | 0.73 (0.3σ) | 0.77 (0.3σ) | 0.82 (0.2σ) |
| Spectral index at 24 H | 0.74 (0.3σ) | 0.75 (0.3σ) | 0.35 (0.9σ) |
Notes. The KS test is performed to compare the distribution of the parameters computed from the light curve measured by Swift/XRT between the overall sample, the ones observed by H.E.S.S and those detected at VHE. Significant deviations (p < 0.01) are seen for fluence during observations and for flux at various epochs in VHE-detected GRBs, suggesting these brightness parameters differ from the overall population, while spectral indices remain statistically consistent.
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