Early photometric and spectroscopic observations of the extraordinarily bright INTEGRAL-detected GRB 221009A

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Table 5.

Spectral indices obtained from fitting the SEDs given in the right panel of Figure 6.

Time (s)	β_o	β_x	p
SED 1 at 3000–10 000	–	–0.67 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	1.34 ± 0.04
SED 2 at 20 000–30 000	–0.73 $_{- 0.14}^{+ 0.14}$ $_{-0.14}^{+0.14}$	–0.80 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	1.60 ± 0.04
SED 3 at 160 000–250 000	–0.58 $_{- 0.11}^{+ 0.11}$ $_{-0.11}^{+0.11}$	–0.74 $_{- 0.06}^{+ 0.06}$ $_{-0.06}^{+0.06}$	1.48 ± 0.12
SED 4 at 500 000–700 000	–0.23 $_{- 0.11}^{+ 0.11}$ $_{-0.11}^{+0.11}$	–0.92 $_{- 0.11}^{+ 0.11}$ $_{-0.11}^{+0.11}$	1.84 ± 0.22

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