The "anti-phase" behavior of blazars S4 0954+65 and B2 1308+326 in January 2023
ATel #15861; V. V. Vlasyuk, O. I. Spiridonova, A. S. Moskvitin, O. A. Maslennikova (Special Astrophysical Observatory of the Rus. Ac. Sci.)
on 15 Jan 2023; 15:13 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)
Subjects: Optical, Blazar, Transient
Blazars S4 0954+65 and B2 1308+326 are observing by SAO RAS team on a regular basis in search of possible correlation between its optical and radio activity events. We had used SAO RAS 1-meter and 0.5-meter reflectors within course of our studies as was described in our earlier telegrams (ATel#15344, #15376, #15633).
After period of some quiet phase for S4 0954+658 in end of 2022 and time of invisibility for B2 1308+326 they begun demonstrate an opposite behavior since January of 2023.
The S4 0954+658 in opposite its name as "flaring" after brightness at level about 16th R-magnitude till end of 2022 undergone quite rapid fading to R=17.02 mag at January 10/11 night (MJD=59954.98). We had not data for January 1-9 period, so time of real fading is still under question. Within following 3 consecutive nights the blazar showed quite fast restoration to level of end of December (our data gave its R=16.23 for epoch MJD=59957.98). Let us to note that S4 0954+658 exceeds its faintest levels for 2021-2022 period. More accurate data reduction may some emphasize this result in future.
FSRQ B2 1308+326 after stage with R ~14.1-14.3 in last week of December, as seems to us, begun new climbing to its local maximum: from 13.64 (MJD=59955.0) through 13.50 (MJD=59957.1) to 13.36 at last night (MJD=59958.0).
All last data were taken under excellent weather condition (seeing between 1 and 1.5 arcsec) but with bright Moon sky and have typical accuracy 0.02 mags. More accurate reduction and deeper analysis of our collected data is necessary. We strongly encourage further multi-wavelength coverage.
