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NIR flaring of the FRQS B3 1708+433

ATEL # 3030; L. Carrasco, A. Carramiņana, J.R. Valdes, E. Recillas, G. Escobedo, A. Porras, Y.D. Mayya (INAOE, Mexico)
on 13 Nov 2010; 18:31 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: LUIS CARRASCO (

Subjects: Radio, Infra-Red, Optical, Gamma Ray, >GeV, Request for Observations, AGN, Quasars

We report the ongoing NIR flare of the flat spectrum radio source B31708+433, a z=1.027 Flat Radio QSO also known as CGRaBS J1709+4318, identified with a flaring FERMI/LAT source reported by Allafort in (ATel #3026). The source was not detected by the 2mass NIR survey (estimated H magnitude limit for this field ~16.4). Yet, on November 13th,2010 (JD 2455513.551228), we detected a strong NIR source coincident with the radio position. We determined the flux from this object to correspond to H = 13.055 +/- 0.05, J = 13.848 +/- 0.05 and Ks = 12.040 +/- 0.06. That is at least 3.2 mag brighter than the limiting flux of the 2mass in the H band. Henceforth, this QSO has had a recent increase in flux of 20 approximately. This NIR flux enhancement is consistent with the FERMI/LAT detection of the source. Observations were 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. Our observation provides further support for the identification of the Gamma Ray source with the radio one. We encourage further multi wavelength coverage for this variable source.

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