Historical NIR light maximum of the blazar B2 2234+28A
ATel #16872; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix;(INAOE, Mexico)
on 21 Oct 2024; 22:49 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Optical, Gamma Ray, TeV, AGN, Blazar, Quasar
We report on the recent NIR brightening of Flat Spectrum Radio Quasar (FSRQ) B2 2234+28A, also known as 2FGL J2236.4+2828. On September 22th, 2024 (JD2460575.9109) we found the blazar B2 2234+28A in an historically bright NIR flare in a lapse over 14 years of our observations. The NIR fluxes in the JHK bands were: J=13.141+/-0.039, H=12.194+/-0.051 and Ks=11.476+/-0.049. While the NIR fluxes in the H band on JD2457329.8013 it was H=16.706+/-0.05. Hence, the object has increased its luminosity in the H band by a factor of almost 64 in this lapse. One week ago, on Octuber14th, 2024 (JD2460597.6964), the object had decreased its brightness to, H=13.154+/-0.032. 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.
