Historical NIR light maximum of the FSRQ PKS 1725+123
ATel #17127; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix;(INAOE, Mexico)
on 2 Apr 2025; 23:33 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Optical, Gamma Ray, TeV, AGN, Blazar, Quasar
Following Fermi-LAT detection of gamma-ray activity of FSRQ PKS 1725+123 (ATel#17094) recently reported. On March 22th 2025 (JD 2460756.9738) we found the Flat Spectrum Radio Quasar PKS 1725+123, also known as 4FGL J1728.0+1216, in an historically bright NIR flare in a lapse over 14 years of observations. The NIR fluxes in the JHK bands were: J=13.971+/-0.05, H=12.917+/-0.04 and Ks=11.953+/-0.05. While the NIR fluxes in the H band on JD 2455675.9841 it was H=17.208+/-0.08 (ATel#4201). Hence, the object has increased its luminosity in the H band by a factor of 52 in this lapse. Our observations are carried out with CANICA instrument at the 2.1m telescope of the Guillermo Haro Observatory, which is operated by the National Institute for Astrophysics, Optics and Electronics (INAOE, Mexico). We encourage further multiwavelength observations.
