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Fast NIR Flare and Historical light maximum of the blazar 3C345

ATel #16309; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix; (INAOE, Mexico)
on 26 Oct 2023; 18:41 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)

Subjects: Radio, Infra-Red, Optical, Gamma Ray, TeV, AGN, Blazar, Quasar

Referred to by ATel #: 16320

Following Fermi-LAT detection of gamma-ray activity of FSRQ 3C345 (ATel#16274) and its optical outburst recently reported, (ATel#16305 and ATel#16306). On October 4th 2023 (JD 2460221.6231) we found the blazar 3C345 in historically bright NIR flare over 14 years of observations. We here report NIR fluxes of the source during the maximum, 9 days before and 19 days later of the peak values. The Julian Day (JD) corresponding to the middle of exposures, measured magnitudes in the three bands in the Vega system, and error on each measurements for each epoch of observations are given below: JD Filter Mag error 2460212.639711 J 14.532 0.033; 2460221.623113 J 13.473 0.031; 2460240.609097 J 14.955 0.055; 2460212.628461 H 13.627 0.022; 2460221.620822 H 12.617 0.023; 2460240.602512 H 14.051 0.026; 2460212.655081 Ks 12.944 0.063 2460221.631111 Ks 11.883 0.048 2460240.622604 Ks 13.169 0.052 Hence, the object has undergone an increase in JHK band fluxes of a factor of 2.7, 2.5 and 2.7 respectively in this short period of time. After the maximum the decrease factor of the fluxes was 3.9, 3.8 and 3.3 for the JHK band. Our observations are carried out using 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).