3C273 (z = 0.158)
Fermi LAT Gamma-ray flux (in units of 1.E-7 phot/cm^2/s; magenta symbols - upper limits), X-ray flux (Swift XRT, in units of 1.E-11 erg/cm^2/s), and optical light curve and degree and position angle of optical polarization obtained at the Perkins telescope (PTO, Flagstaff, AZ) vs. time.