Historical NIR light maximum of the blazar Ton 599 (4C +29.45)
ATel #17248; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix;(INAOE, Mexico)
on 26 Jun 2025; 19:03 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Gamma Ray, TeV, AGN, Blazar, Quasar
We here report on the recent NIR brightening of the flat spectrum radio quasar Ton 599 (4C +29.45), also known as 4FGL J1159.5+2914. On June 6th, 2025 (JD 2460832.7318) we found the object undergoing in an historically bright NIR flare in a lapse over 17 years of our observations. The NIR fluxes in the JHK bands were: J=12.005+/-0.055, H=11.300+/-0.055 and Ks=10.121+/-0.055. While the NIR fluxes in the H band on JD 2458656.6692 it was H=15.666+/-0.030. Hence, the object has increased its luminosity in the H band by a factor of 55 in this lapse. Recently, the object has shown renewed gamma-ray activity (ATel#17226). Our observations are carried out with CANICA a NIR camera on the 2.1m telescope at the Observatorio Astrofisico Guillermo Haro, which is operated by the National Institute for Astrophysics, Optics and Electronics (INAOE, Mexico). We encourage further multiwavelength observations.
