Table 5
Time-resolved spectral analysis of the first episode in GRB 090618.
| Time | α | β | E0 (keV) |
|
kT (keV) | γ |
|
kTLAD (keV) | γLAD |
|
|
|
||||||||||
| A:0–5 | –0.45 ± 0.11 | –2.89 ± 0.78 | 208.9 ± 36.13 | 0.93 | 59.86 ± 2.72 | 1.62 ± 0.07 | 1.07 | 52.52 ± 23.63 | 1.42 ± 0.06 | 0.93 |
| B:5–10 | –0.16 ± 0.17 | –2.34 ± 0.18 | 89.84 ± 17.69 | 1.14 | 37.57 ± 1.76 | 1.56 ± 0.05 | 1.36 | 37.39 ± 2.46 | 1.55 ± 0.06 | 1.27 |
| C:10–17 | –0.74 ± 0.08 | –3.36 ± 1.34 | 149.7 ± 21.1 | 0.98 | 34.90 ± 1.63 | 1.72 ± 0.05 | 1.20 | 36.89 ± 2.40 | 1.75 ± 0.06 | 1.10 |
| D:17–23 | –0.51 ± 0.17 | –2.56 ± 0.26 | 75.57 ± 16.35 | 1.11 | 25.47 ± 1.38 | 1.75 ± 0.06 | 1.19 | 25.70 ± 1.76 | 1.75 ± 0.08 | 1.19 |
| E:23–31 | –0.93 ± 0.13 | unconstr. | 104.7 ± 21.29 | 1.08 | 23.75 ± 1.68 | 1.93 ± 0.10 | 1.13 | 24.45 ± 2.24 | 1.95 ± 0.12 | 1.31 |
| F:31–39 | –1.27 ± 0.28 | –3.20 ± 1.00 | 113.28 ± 64.7 | 1.17 | 18.44 ± 1.46 | 2.77 ± 0.83 | 1.10 | 18.69 ± 1.89 | 4.69 ± 4.2 | 1.08 |
| G:39–49 | –3.62 ± 1.00 | –2.19 ± 0.17 | 57.48 ± 50.0 | 1.15 | 14.03 ± 2.35 | 3.20 ± 1.38 | 1.10 | 14.71 ± 3.52 | 3.06 ± 3.50 | 1.09 |
Notes. We considered seven time intervals and used two spectral models, whose best-fit parameters are shown here. The last three columns, marked with a LAD subscript, report the same analysis but in the energy range 20 − 1900 keV, which is the same energy range of the BATSE-LAD detector as used in the work of Ryde & Pe’er (2009).
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