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A large NIR flare of the FSRQ Ton599

ATel #10932; L. Carrasco, G. Escobedo, E. Recillas, A. Porras, V. Chavushyan, D. Y. Mayya (INAOE, Mexico)
on 6 Nov 2017; 21:49 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)

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

Referred to by ATel #: 10937, 10938, 10948, 10949

We report on a large NIR flare of the high redshift QSO (z=0.724488) TON599 cross identified with the radio source 4C+29.45 and the Gamma-ray source 3FGLJ1159.5+2914 On November 6th,2017 MJD(2458064.0247), we found the source with NIR fluxes corresponding to J = 12.692 +/- 0.07, H = 12.074 +/- 0.08 and Ks = 10.842 +/- 0.07. While, on MJD 2457936.639 the flux in the NIR bands corresponded to J = 14.973 =/- 0.07, H = 13.936 +/- 0.05 and K = 13.176 +/- 0.07. Hence, the source has increased its flux by a factor of 9 in the K band in this this short lapse. The source is brightest since the time we started monitoring it on MJD 2454589.7. The object is also flaring in Gamma rays as reported by LAT Fermi, ATel # 10931. 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 encourage further multi wavelength coverage.