Table B.1.
Results of the spectral analysis of the Swift-XRT observations of BL Lac during September to November 2022.
| Day | MJD | ObsID | Exposure | Significance [σ] | Flux (0.3 − 10 keV) | Flux (2.0 − 10 keV) | Spectral index |
|---|---|---|---|---|---|---|---|
| [s] | Log-parabola model | [×10−12 erg cm−2 s−1] | [×10−12 erg cm−2 s−1] | ||||
| 09/16 | 59838.6 | 00014925014 | 1981 | 1.7 | 53 ± 5 | 24 ± 2 | 1.81 ± 0.02 |
| 09/18 | 59840.5 | 00014925015 | 1994 | 1.9 | 19 ± 2 | 11 ± 1 | 1.63 ± 0.02 |
| 09/20 | 59842.3 | 00014925016 | 572 | 0.9 | 26 ± 3 | 13 ± 3 | 1.82 ± 0.02 |
| 09/23 | 59845.5 | 00014925017 | 705 | 0.3 | 24 ± 3 | 14 ± 2 | 1.70 ± 0.02 |
| 10/17 | 59869.8 | 00014925018 | 1102 | 1.5 | 42 ± 3 | 18 ± 2 | 2.10 ± 0.02 |
| 10/17 | 59869.9 | 00014925019 | 1412 | 0.4 | 40 ± 3 | 18 ± 2 | 2.00 ± 0.02 |
| 10/22 | 59874.4 | 00014925021 | 1978 | 3.7 | 77 ± 5 | 24 ± 3 | 2.33 ± 0.02 |
| 10/23 | 59875.8 | 00014925020 | 1832 | 4.3 | 56 ± 5 | 26 ± 2 | 1.92 ± 0.02 |
| 10/25 | 59877.0 | 00014925023 | 1008 | 3.8 | 55 ± 6 | 27 ± 5 | 1.82 ± 0.02 |
| 10/26 | 59878.3 | 00096990012 | 1034 | 1.9 | 37 ± 3 | 23 ± 2 | 1.70 ± 0.02 |
| 10/29 | 59881.1 | 00014925024 | 1661 | 3.4 | 78 ± 5 | 27 ± 3 | 2.09 ± 0.02 |
| 11/01 | 59884.1 | 00014925026 | 951 | 1.1 | 72 ± 3 | 27 ± 2 | 2.16 ± 0.02 |
| 11/04 | 59887.3 | 00014925027 | 1240 | 2.3 | 87 ± 5 | 32 ± 3 | 2.22 ± 0.02 |
| 11/07 | 59890.1 | 00014925028 | 1035 | 4.2 | 60 ± 5 | 24 ± 3 | 2.15 ± 0.02 |
| 11/12 | 59895.4 | 00096990013 | 849 | 1.9 | 219 ± 11 | 50 ± 3 | 2.60 ± 0.03 |
| 11/13 | 59896.3 | 00014925030 | 1278 | 2.2 | 64 ± 3 | 21 ± 2 | 2.33 ± 0.02 |
| 11/21 | 59904.8 | 00014925032 | 1681 | 2.4 | 66 ± 3 | 26 ± 2 | 2.14 ± 0.02 |
| 11/23 | 59906.0 | 00014925033 | 1447 | 2.7 | 124 ± 8 | 34 ± 3 | 2.43 ± 0.02 |
| 11/25 | 59908.4 | 00096990014 | 865 | 2.0 | 93 ± 5 | 27 ± 2 | 2.43 ± 0.02 |
| 11/25 | 59908.7 | 00014925034 | 2021 | 2.5 | 69 ± 6 | 24 ± 3 | 2.14 ± 0.02 |
| 11/26 | 59909.5 | 00096990015 | 905 | 2.6 | 71 ± 6 | 27 ± 3 | 2.14 ± 0.02 |
| 11/27 | 59910.2 | 00096990016 | 834 | 2.8 | 97 ± 15 | 29 ± 6 | 2.35 ± 0.02 |
| 11/28 | 59911.9 | 00089562001 | 1473 | 3.7 | 61 ± 5 | 24 ± 2 | 2.09 ± 0.02 |
| 11/29 | 59912.2 | 00096990017 | 826 | 2.7 | 98 ± 8 | 31 ± 5 | 2.33 ± 0.02 |
| 11/30 | 59913.4 | 00096990018 | 895 | 3.7 | 84 ± 13 | 47 ± 10 | 1.82 ± 0.02 |
| 12/01 | 59914.1 | 00096990019 | 960 | 3.2 | 80 ± 8 | 32 ± 5 | 2.09 ± 0.02 |
Notes. For each observation, the following quantities are reported: day, MJD, Swift ObsID, exposure, intrinsic flux reconstructed in the 0.3 − 10 keV and 2.0 − 10 keV bands and photon index from the fit assuming a power-law model for the intrinsic source spectrum. For those observations in which the log-parabola model was preferred over the power-law at a significance greater than 3σ, the reported fluxes were reconstructed from the best-fit log-parabola model.
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