30 years of multi-wavelength observations of 3C 273
Courvoisier, T. J-L.
Stevens, J. A.
Ulrich, M. H.
We present a wide multi-wavelength database of most observations of the quasar 3C273 obtained during the last 30 years. This database is the most complete set of observations available for an active galactic nucleus (AGN). It contains nearly 20 000 observations grouped together into 70 light curves covering 16 orders of magnitude in frequency from the radio to the -ray domain.