A Giant NIR flare of the Blazar CGRaBSJ1257+3229
ATel #9084; L. Carrasco, E. Recillas, A. Porras, V. Chavushyan, J. Leon-Tavares (INAOE, Mexico)
on 27 May 2016; 07:59 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Optical, Gamma Ray, AGN, Blazar, Quasar
We report on a giant NIR flare of the high redshift Blazar CGRaBSJ1257+229 (z=0.805949), also known as QSO B2 1255+32 associated with the gamma-ray source 2FGLJ1258.2+3231. Our most recent NIR photometry for this source shows that on April 20th,2016 (MJD 2457498.9046), the object brightness corresponded to H = 13.304 +/- 0.05, J = 14.258 +/- 0.04 and Ks = 12.534 +/- 0.05. In our previous observation in these bands (MJD2457183.7), this object had H = 16.328 +/- 0.04, J = 16.464 +/- 0.05 and Ks = 14.887 +/- 0.04. Hence, the object has increased its luminosity by a factor of about 16 in this lapse. At present time the object is brightest since the time (MJD 2455245), when we started monitoring it in the NIR. Our observations are 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 multiwavelength coverage.
