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A New NIR Flare of the FSRQ S4 0954+658

ATel #8445; L. Carrasco, E. Recillas, A. Porras, V. Chavushyan, D. Y. Mayya, A. Carraminana (INAOE, Mexico)
on 21 Dec 2015; 08:46 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)

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

Referred to by ATel #: 16010

We report on a new NIR flare of the intermediate redshift FSRQ S4 0954+658 (z=0.368), also known as CGRaBSJ0958+6533 associated with the gamma-ray source 2FGL0958.6+6533. Our most recent NIR photometry for this source shows that on December 20th,2015 (JD2457376.9444), the object brightness corresponded to J = 13.561 +/- 0.03, H = 12.736 +/- 0.03 and Ks = 11.947 +/- 0.05. The NIR fluxes in the JHK bands had a fast increase since our previously observed fluxes were: J = 14.171 +/- 0.04, H = 13.299 +/- 0.05 and Ks = 12.415 +/- 0.03, on JD2457374.0506. Hence the object has increased its luminosity by a factor of about 1.5 in this very short lapse. The object has shown flaring activity in different wavelength bands in the past. (see ATel #3220, #6709, #6996, #7001, #7007, #7046, #7093 #7750). 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.