New blazar 3C345 flare - the most powerful since October 2023
ATel #17059; V. V. Vlasyuk, O. I. Spiridonova, A. S. Moskvitin (Special Astrophysical Observatory of the Rus. Ac. Sci.)
on 2 Mar 2025; 15:12 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)
Subjects: Optical, Blazar
Referred to by ATel #: 17085
Our BVRI-monitoring of the bright blazars sample using by our 1-meter and 0.5-meter reflectors is in progress.
The blazar 3C 345 shows an increase in the optical spectral range after 16 month of rather quiet behavior after flare with R = 15.2 mag in October of 2023 (see ATel #16306). According to our estimates its brightness varied between 16.6 and 17.3 mag since November of 2023 till last January.
The brightening phase for 3C 345 started in last February --- between January 01 and 30 our measurements gave its brightness in range 16.8--17.3 mag. But observations at Feb. 27/28 night (MJD 60734.03) showed significant increasing of its flux --- 16.14 +/- 0.01 mag. The following monitoring confirmed this result: at March 01/02 night (MJD 60736.09) the blazar became brighter up to R = 16.01 +/- 0.005.
The monitoring of 3C 345 is continuing; the most of data presented were taken under good weather condition (seeing (FWHM) < 2 arcsec and normal transparency) and have typical accuracy about 0.005 mags. We strongly encourage further multi-wavelength studies.
