Large NIR Flare of the FSQR 4C+27.50
ATel #15799; L. Carrasco, G. Escobedo, E. Recillas, A. Porras,(INAOE, Mexico)
on 8 Dec 2022; 17:32 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Infra-Red, Gamma Ray, AGN, Blazar, Quasar, Transient
Following the reports of enhanced gamma ray and optical emission (Atel#15549,#15557) of the high redshift FSRQ 4C+27.50n (z=1.255) cross identified with the Gamma-ray source 4FGLJ2321.9+2734 and the
optical source B22319+27, on December 1st,2022 (JD2459915.8090) we found this source undergoing a huge
NIR flare. The NIR fluxes at this time were J=12.646+/-0.04, H=11.736+/-0.03 and Ks=10.893+/-0.04. These values are to be compared with ones determined by 2MASS J=16.078+/-0.118, H=15.431+/-0.133 and
Ks=14.409+/-0.075. Thus, we have detected a flux increment of a factor 30 in the H band since the time it was observed by the 2MASS survey. We have incorporated this source to our NIR monitoring program of Blazars. Our observations are carried out with the 2.1m telescope of the Guillermo Haro Observatory of the National Institute for Astrophysics, Optics and Electronics (Mexico), equipped with the instrument CANICA a NIR camera. We encourage further multi wavelength coverage of this object.
