Table 1.
Time-resolved spectral analysis of GRB 230812B using Fermi/GBM data.
| Bin | t − T0 | Model | α | β | Epeak | Flux | stat/ dof |
|---|---|---|---|---|---|---|---|
| [s] | [keV] | [erg cm−2 s−1] | |||||
| Bin 1 | 0–0.4 | Band | −0.61 ± 0.02 | −3.25 ± 0.33 | 813.1 ± 58.7 | (1.47 ± 0.06)×10−4 | 758/561 |
| Bin 2 | 1.4–2.0 | Band | −0.22 ± 0.03 | −3.03 ± 0.09 | 77.9 ± 2.3 | (5.67 ± 0.13)×10−5 | 699/561 |
| Bin 3 | 2.0–3.6 | Band | −0.65 ± 0.03 | −2.97 ± 0.07 | 63.9 ± 2.3 | (1.70 ± 0.04)×10−5 | 799/561 |
| Bin 4 | 3.6–10.2 | BPL | −1.66 ± 0.04 | −3.00 ± 0.06 | 99.2 ± 3.1 | (6.02 ± 0.05)×10−6 | 805/135 |
| Bin 5 | 10.2–25.0 | PL | −2.31 ± 0.32 | – | – | (8.12 ± 1.66)×10−8 | 248/133 |
| Bin 6 | 25.0–250.0 | PL | −2.40 ± 0.23 | – | – | (2.30 ± 0.32)×10−9 | 200/135 |
| Bin 7 | 251.9–647.2 | PL | −1.12 ± 0.44 | – | – | (7.16 ± 1.84)×10−10 | 323/200 |
Notes. Bins 1–3 (from trigger to the end of T90) represent the prompt emission, well-described by the Band function in the 8 keV–40 MeV range. Bin 4 marks the transition phase from prompt to afterglow, while bins 5–7 correspond to the keV-MeV afterglow, fitted with a power-law model in the 40–400 keV range. The best-fit spectral models for each time bin are listed in column 3.
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