The FSRQ B2 1308+326: an unusual gently sloping dimming after absolute maximum at R~12.6
ATel #15515; V. V. Vlasyuk, O. I. Spiridonova, A. S. Moskvitin, O. A. Maslennikova (Special Astrophysical Observatory of the Rus. Ac. Sci.)
on 16 Jul 2022; 08:37 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)
Subjects: Optical, Quasar
Our team continued brightness monitoring of the flat spectrum radio quasar B2 1308+326 within last weeks and found it's some unexpected gentle sloping dimming. Our measurements at one week interval are some differs from ones, presented in (ATel #15496). They are presented in table below. We should note that all our data do not present any sign of fast variation and lying within interval 0.01--0.02 magnitudes from mean value for each epoch.
| Epoch, MJD | Rmag | Errmag |
| 59762.825 | 12.82 | 0.01 |
| 59763.895 | 12.71 | 0.01 |
| 59764.800 | 12.59 | 0.01 |
| 59765.815 | 12.65 | 0.01 |
| 59766.820 | 12.73 | 0.01 |
| 59767.835 | 12.860 | 0.005 |
| 59768.805 | 12.895 | 0.005 |
| 59769.835 | 12.995 | 0.005 |
After one week break in our observations we found that it's current brightness (at MJD=59775.805) equals to Rmag=13.39 +/- 0.01 mag, so the mean slope brightness dimming is about 0.4 magnitudes per week and is very close to ones for epoch after maximum (0.4 magnitudes per 5 days).
All data were taken using by 0.5-meter RC telescope of SAO RAS. More accurate reduction is necessary. We strongly encourage further multi-wavelength observations.
