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Table 1.
Spectral indices of the nuclear region at 15–43 GHz.
| Time (MJD) |  |
|---|---|
| Before | |
| 54411.50 | −0.71 ± 0.13 |
| 54706.50 | −0.28 ± 0.13 |
| 55001.50 | −0.46 ± 0.13 |
| 55296.50 | −0.39 ± 0.13 |
| 55591.50 | −0.15 ± 0.13 |
| 55886.50 | −0.32 ± 0.13 |
| 56181.50 | −0.17 ± 0.13 |
| 56476.50 | −0.25 ± 0.13 |
| After | |
| 59561.50 | −0.07 ± 0.13 |
| 59684.50 | 0.25 ± 0.13 |
| 59807.50 | 0.23 ± 0.13 |
| 59930.50 | 0.05 ± 0.13 |
| 60053.50 | 0.08 ± 0.13 |
| 60176.50 | 0.22 ± 0.13 |
| 60299.50 | 0.05 ± 0.13 |
| 60422.50 | −0.25 ± 0.13 |
Notes. Spectral indices 
were derived from quasi-simultaneous flux measurements between 15 and 43 GHz before and after the IceCube-211208A event. The uncertainties represent the 1σ errors.
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