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NIR flaring of the QSO B2 2308+34

ATEL # 3024; L. Carrasco, A. Carramiņana, J.R. Valdes, G. Escobedo, E. Recillas, A. Porras, Y.D. Mayya (INAOE, Mexico)
on 11 Nov 2010; 3:36 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 B22308+34, a high redshift QSO z=1.187 [HB89]2308+341, identified with a flaring FERMI/LAT source 1FGL2311.0+3425 reported by D'Ammando in (ATel #2783). The source was not detected by the 2mass NIR survey (estimated H magnitude limit for this field ~16.8) . Yet, on November 10th,2010 (JD 2455510.634204), we detected a NIR source coincident with the radio position. We determined the flux from this object to correspond to H = 14.708 +/- 0.03, that is at least 2 mag brighter than the limiting flux of the 2mass. 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 (Mexico) and 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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