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Table 3
Quasi-simultaneous optical observations of 3C 345, NRAO 512 and B3 1640 + 396 conducted by Swift UVOT and the 200-mm telescope of Tzec Maun observatory.
| Source | Obs. date (*) | Band | Magnitude | |
|
|
||||
| 3C 345: | 2009-01-26 (4858) | R | 16.48 ± 0.02 | |
| 2009-02-13 (4876) | R | 16.92 ± 0.03 | ||
| 2009-10-08 (5113) | U | 16.44 ± 0.06 | ||
| 2009-10-08 (5113) | UVW1 | 16.28 ± 0.03 | ||
| 2010-08-18 (5427) | UVW1 | 16.47 ± 0.02 | ||
| NRAO 512: | 2009-10-08 (5113) | U | 18.61 ± 0.04 | |
| 2010-08-06 (5415) | U | 17.71 ± 0.05 | ||
| 2010-08-06 (5415) | UVW1 | 18.07 ± 0.02 | ||
| B3 1640+396: | 2009-01-26 (4858) | R | 18.57 ± 0.13 | |
| 2009-02-13 (4876) | R | >18.6† | ||
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