Historical optical light maximum of the FSRQ PKS 1725+123
ATel #17345; Sergiy Guziy (IAA-CSIC Granada), Ignacio Perez-Garcia (IAA-CSIC), Emilio Fernandez-Garcia (IAA-CSIC), Petrus J. Meintjes (UFS Bloemfontein), Hendrik J. van Heerden (UFS), Maria Gritsevich (Univ. of Helsinki) and Alberto J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration
on 19 Aug 2025; 22:41 UT
Credential Certification: Alberto J. Castro-Tirado (ajct@iaa.es)
Subjects: Optical, AGN, Quasar
Referred to by ATel #: 17346
Following both the MAGIC and CTAO LST first detections of very-high-energy (VHE; E>100 GeV) gamma-ray emission from PKS 1725+123 (ATEL #17344), the 0.6m DPR robotic telescope at the BOOTES-6 station in Boyden Observatory (South Africa) observed this target in ugriZY-bands, starting on Aug 19, 18:47 UT.
PKS 1725+123 is well detected in all filters, and we measure g = 14.67 +/- 0.02, r = 14.21 +/- 0.02, i = 13.89 +/- 0.02 (60-s exposures) on Aug 19, 18:50 UT. This seems to imply that PKS 1725+123 will be approaching a historical optical light maximum, following the NIR historical flare of March 2025 (ATEL #17127).
Follow-up observations (gamma-rays, X-rays, optical, NIR, radio) are strongly encouraged during the coming days.
