Table 1
Spectral parameters from the Fermi/LAT likelihood analysis.
| Hypothesis | TS | First parameter | Second parameter | F0.2−300 GeV (10-8 ph cm-2 s-1) | LLRT / Prob. | ||
|
|
|||||||
| PL | 2236.13 | 1.94 ± 0.03 | – | 2.08 ± 0.10 | – | ||
| Low state | BPL | 2239.15 | 1.69 ± 0.18 | 1.98 ± 0.04 | 1.97 ± 0.13 | 2.15 / 22.6% | |
| LP | 2236.91 | 1.92 ± 0.04 | 0.013 ± 0.017 | 2.04 ± 0.11 | 0.53 / 39.2% | ||
|
|
|||||||
| PL | 1190.20 | 1.86 ± 0.05 | – | 34.3 ± 2.5 | – | ||
| High state | BPL | 1193.52 | 1.41 ± 0.39 | 1.91 ± 0.07 | 33.4 ± 5.2 | 1.54 / 26.6% | |
| LP | 1193.01 | 1.80 ± 0.07 | 0.041 ± 0.034 | 33.6 ± 2.5 | 1.56 / 26.4% | ||
Notes. LLRT is the log-likelihood ratio test. The first parameter corresponds to the photon index Γ for a power-law (PL) hypothesis or α for a log-parabola (LP) hypothesis, or to the first photon index Γ1 for a broken power-law (BPL) hypothesis. The second parameter is either the second photon index Γ2 in the case of a BPL hypothesis or the curvature parameter β for a LP hypothesis. For the LP model Eb is fixed at 1 GeV. The break energy for the BPL is, respectively, 0.60 ± 0.15 GeV and 0.47 ± 0.33 GeV in the low and high states.
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