Maximum NIR light os BL Lac
ATel #14902; L. Carrasco, E. Recillas, G. Escobedo, A. Porras, D. Y. Mayya (INAOE, Mexico)
on 8 Sep 2021; 01:26 UT
Distributed as an Instant Email Notice Transients
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Infra-Red, Gamma Ray, AGN, Blazar, Transient
We report on the recent NIR maximum light of BL Lac, identified with the gamma-ray source 2FGLJ2202.8+4216. On August 21th,2021 (JD 2459447.87), we found the source with the following fluxes in the NIR: J= 10.447 +/- 0.03, H = 9.330 +/- 0.04 and Ks = 8.424 +/- 0,05. These are to be compared with our previous observation on MJD 2459382.96, when the source flux corresponded to J = 11.714 +/- 0.03, H = 10.352 +/- 0.04 and Ks = 9.498 +/- 0.04. Hence, the source has had a flux increment of one magnitude in H, in this lapse. This source has shown flaring activity in the past (see ATEL #6572, #8311). The fluxes reported here correspond to a historical maximum since we started monitoring it on JD 2454551.91.
Our observations are carried out with the 2.1m telescope of the Guillermo Haro Observatory operated by the National Institute for Astrophysics, Optics and Electronics (Mexico), equipped with the instrument CANICA, a NIR camera. We strongly encourage further multiwavelength coverage.
