Near-infrared brightening of BL Lacertae
ATel #4277; M. I. Carnerero (INAF, Osservatorio Astrofisico di Torino, Italy and Instituto de Astrofisica de Canarias, Spain and Depto. de Astrofisica, Universidad de La Laguna, Spain), A. I. Gonzalez (Depto. de Astrofisica, Universidad de La Laguna, Spain ), J. A. Acosta Pulido (Instituto de Astrofisica de Canarias, Spain and Depto. de Astrofisica, Universidad de La Laguna, Spain), C. M. Raiteri and M. Villata (INAF, Osservatorio Astrofisico di Torino, Italy), for the GASP collaboration.
on 26 Jul 2012; 14:09 UT
Credential Certification: Claudia M. Raiteri (raiteri@oato.inaf.it)
Subjects: Infra-Red, Blazar
Near-infrared observations at the Teide Observatory, in the framework of the GLAST-AGILE Support Program (GASP) of the Whole Earth Blazar Telescope (WEBT) confirm a rapid brightening of BL Lacertae, as reported by ATel#4271.
Here we report on four observations obtained at the Carlos Sanchez Telescope in a week period, according to which the source has increased its brightness by 0.7 mag.
On 2012 July 20.14 the source was observed at J=11.25 +/-0.01 (H=10.27+/-0.01
and Ks=9.46+/-0.01), on July 21.15 at J=11.00+/-0.02 (H=10.02+/-0.02,
Ks=9.21+/-0,02), on July 24.98 at J=10.72+/-0.01 (H=9.76+/-0.01,
Ks=8.94+/-0.01), and on July 26.12 at J=10.57+/-0.01 (H=9.58+/-0.01,
Ks=8.77+/-0.01).
