Optical and gamma-ray brightening of the blazar PKS 0537-441
Roberto Nesci (INAF/IAPS-Roma), Roopesh Ojha (NASA/GSFC/UMBC)
During our monitoring in the optical-NIR with the REM telescope of some southern AGNs of the TANAMI project (Mueller et al. 2018, A&A, 610, 1), we found that PKS0537-441 is steadily recovering from its faint state (below our detection threshold H=15 mag) since MJD 58465 and is now (MJD 58486) at H=13.71, J=14.65. The public Gamma-ray light curve by Fermi-LAT shows a clear detection in the weekly averaged data at 2E-7 ph cm-2 s-1 in the full (100 MeV - 300 GeV) sensitivity band, with a daily detection at 4.5E-7 ph cm-2 s-1 on MJD 58476. During our previous REM monitoring (MJD 55600 - 55900) the average luminosity of the source was J=13.0 mag with an average Fermi-LAT flux of 4.0E-7 ph cm-2 s-1.
optical,gamma ray,agn,blazar