Fast NIR Flare of the blazar Ton 599 (4C +29.45)
ATel #16629; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix; ( INAOE, Mexico )
on 22 May 2024; 22:07 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Optical, Gamma Ray, TeV, AGN, Blazar, Quasar
We report on the recent fast NIR brightening of the flat spectrum radio quasar Ton 599 (4C +29.45), also known as 4FGL J1159.5+2914. On May 1st, 2024 (JD2460431.8587), we found the object undergoing a new outburst. The NIR fluxes in the JHK bands were: J=13.344+/-0.030 (JD2460431.8587), H=12.408+/-0.053 (JD2460431.8496) and Ks=11.600+/-0.047 (JD2460431.8750). These magnitudes correspond to a flux almost twice brighter than the fainter light observed one day before, (JD2460430.8653) J=13.989+/-0.038 , H=13.053+/-0.050 and Ks=12.150+/-0.070. Three days later, on JD2460434.8418, the object had decreased its brightness to fluxes, J=14.081+/-0.047 , H=13.209+/-0.032 and Ks=12.254+/-0.070. Recently, the object has shown flaring activity at the NIR bands (ATel#16593). 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.
