A Large NIR Flare and fast changes of the QSO CGRaBSJ1700+6830
ATel #16299; L. Carrasco, G. Escobedo, A. Porras, E. Recillas, L. Felix; (INAOE, Mexico)
on 19 Oct 2023; 19:22 UT
Credential Certification: LUIS CARRASCO (carrasco@inaoep.mx)
Subjects: Radio, Infra-Red, Optical, Gamma Ray, TeV, AGN, Blazar, Quasar
On our recent NIR observation of the intermediate redshift QSO CGRaBS J1700+6830 (z=0.301) also known as RGB J1700+685, cross correlated with the Gamma ray source 2FGLJ1700.2+6831. On September 24th, 2023 (JD2460211.7020), we found this blazar to be in a new outburst. In the H band, H = 12.194 +/- 0.04. It is a flux about 14 times brighter than previous NIR photometry H = 15.060 +/- 0.03 on JD 2460095.9294. During the following days an important fast changes on the source was detected. The Julian Day (JD) corresponding to the middle of exposures, measured magnitudes in H band in the Vega system, and error on each measurements for each epoch of observations are given below: JD Filter Mag error 2460211.7020 H 12.194 0.04; 2460212.6755 H 12.685 0.04; 2460214.6393 H 12.370 0.03; 2460215.6087 H 12.931 0.04. Our observations are carried out with the CANICA a NIR camera on the 2.1m telescope at the Observatorio Astrofisico Guillermo Haro, which is operated by the National Institute for Astrophysics, Optics and Electronics (INAOE, Mexico). We encourage further multiwavelength observations.
