A Giant NIR Flare of the blazar PKS1830-211
ATel #12784; L. Carrasco, A. Porras, G. Escobedo, E. Recillas, V. Chavushyan (INAOE, Mexico)
on 20 May 2019; 21:57 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 very high redshift quasar PKS1830-211 (z=2.507), also known as BZQJ1833-2103, associated with the gamma-ray source 2FGL1833.6-2103. Our recent NIR photometry for this source shows that on May 8th,2019 (MJD2458611.9629) the object brightness corresponded to J = 12.85 +/- 0.06, H = 12.54 +/- 0.06 and K = 11.78 +/- 0.06. while on MJD 2458603.96 the fluxes were J >17.5, H = 15.708 +/- 0.05 and K = 13.396, hence the object is 3.2 magnitudes brighter in the H Band than our previous photometry, obtained on JD2458603.9578, for this field. Hence it has increased its flux by a factor of 20 in the short lapse of 8 days. The object is brightest since we started monitoring it on JD 2455121. 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.
