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A Large NIR Flare of the blazar GB6 J1604+5714

ATel #4991; L. Carrasco, E. Recillas, A. Porras, A. Carraminana (INAOE, Mexico)
on 19 Apr 2013; 01:28 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)

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

Referred to by ATel #: 9598

We report on a large NIR flare of the intermediate redshift blazar GB6 J1604+5714 (z=0.72) cross identified with the Gamma-ray source 2FGL1604.6+5710. On April 18th, 2013 (JD 2456400.974780), we found the source to have a flux in the H band corresponding to H = 13.209 +/- 0,07, that is 2.7 magnitudes brighter than the lowest flux value H = 15.902 +/- 0.02 observed by our team on JD 2455459.621777 as part of a monitoring campaign of blazars with detected Gamma-ray fluxes. The source was known by its activity previously reported in Atels,#4174, #4184 and #4190. Observations were 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 multi wavelength coverage of this interesting object.