Optical follow-up of 4C 10.45
ATel #16892; Roberto Nesci (INAF/IAPS)
on 1 Nov 2024; 19:43 UT
Credential Certification: Roberto Nesci (roberto.nesci@inaf.it)
Subjects: Optical, Gamma Ray, AGN, Quasar
Following the ATel#16889 regarding the high Gamma-ray flux of 4C 10.45, I observed the source with the 30cm telescope of the Foligno Observatory (K56) on 2024-11-01T17:28 with an R (Cousins) filter. Comparison stars were taken from the PanSTARRS DR1 catalog using the r magnitudes down to r=17.5. Aperture photometry was made with IRAF/APPHOT. The source was detected near the limiting magnitude of the image at r=17.3 +/- 0.1 mag.
The quiescent level of the source is around r=18; public observations by ZTF and ATLAS surveys are available only until one month ago (September 12), both reporting the source at r=17.5. Comparison of the historic Gamma-ray light curve with optical (ATLAS and ZTF) shows a good correlation between optical and Gamma-ray fluxes, with peak optical values up to r=16.4. It is possible that this Gamma-ray flare was rather short, so that the source is already in the descending phase.
