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Near-infrared outburst of BL Lacertae

ATel #5599; M. I. Carnerero (INAF, Osservatorio Astrofisico di Torino, Italy and Instituto de Astrofisica de Canarias, Spain and Departamento de Astrofisica, Universidad de La Laguna, Spain), J. A. Acosta-Pulido, C. Lazaro, A. Grinon-Marin (Instituto de Astrofisica de Canarias, Spain and Departamento de Astrofisica, Universidad de La Laguna, Spain), Pedro A. Gonzalez-Morales (Instituto de Astrofisica de Canarias, Spain), C. M. Raiteri and M. Villata (INAF, Osservatorio Astrofisico di Torino, Italy)
on 26 Nov 2013; 10:11 UT
Credential Certification: Claudia M. Raiteri (raiteri@oato.inaf.it)

Subjects: Infra-Red, AGN, Blazar

Referred to by ATel #: 5601

With reference to ATels #5597 and #5598, we confirm that the outburst state of BL Lacertae detected in the optical and UV bands is also observable in the near-infrared.

Observations carried out with the Carlos Sanchez Telescope at the Teide Observatory in the framework of the GASP-WEBT collaboration showed J=10.38, H=9.42, and Ks=8.52 on 2013 November 21.9 UT. This level is about 2.5 mag brighter than the minimum we observed at the end of 2012 and about 0.2 mag brighter than the maximum we reported in ATel #4277.