A not so recent Fast NIR Flare of the FSRQ S4 0954+658
ATel #17373; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix;(INAOE, Mexico)
on 5 Sep 2025; 18:01 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Gamma Ray, TeV, AGN, Blazar, Quasar
We report on a fast NIR flare of the blazar FSRQ S4 0954+658, also known as CGRaBS J0958+6533, associated with the gamma-ray source 4FGLJ0958.7+6534. On February 21th, 2025 (JD2460727.8623), we found the object undergoing a new outburst. We list the NIR fluxes of the source during the outburst, one day before and one day after peak values:
JD Filters Mag+/-error
2460726.7919 J=12.711+/-0.043; H=11.865+/-0.039; Ks=10.860+/-0.033;
2460727.8623 J=11.764+/-0.042; H=10.891+/-0.032; Ks= 9.893+/-0.034;
2460728.8629 J=12.178+/-0.041; H=11.359+/-0.035; Ks=10.446+/-0.036.
Hence, the object has undergone an increase in JHK band fluxes of a factor of about 2.5 in every bands in this short period of time. After a local temporal maximum, a decrease factor of the fluxes of about 1.6 in the JHK bands was detected. Our observations are carried out using CANICA a NIR camera at the 2.1m telescope of the Guillermo Haro Observatory, which is operated by the National Institute for Astrophysics, Optics and Electronics (INAOE, Mexico).
