This deposit contains supporting materials for the article "The calm before the (next) storm: no third outburst in 2019--2020, and ongoing monitoring of the transient AGN IC 3599" by Grupe, Komossa, and Wolsing (2024), ApJ. The deposit has the following machine-readable tables: MRT_longterm_xray_fig1.txt: contains the data used to create Figure 1. These are 0.2-2.0 keV fluxes of IC 3599 fromm ROSAT, Chandra, and Swift observations. MRT_swift_observations.txt : contains the information about the Swift XRT and UVOT observations, including the Target ID, segement, start and end times in UT, the MJD of the middle of the exposure times in the XRET and each of the UVOT filters. This table is Table 1 in the Appendix of the paper MRT_Swift_results.txt : contains the fluxes measured in the XRT and UVOT filters. These results were used to create Figures 2 - 7. This table is Table 3 in the Appendix of the paper. The deposit conatins the UV W2 image that was use to create Figure 10. This is uvw2_sum_low_2013_2023.fits The files arf_pc_2013_2023.fits , backgr_spec_pc_2013_2023.fits , source_spec_pc_2013_2023.fits were used for the X-ray spectral analysis of the low state data between 2013-2023. This low state spectrum is displayed in Figures 8 and 9, and was used for the spectral energy distribution in Fugure 11. The files arf_pc_high_2010.fits , backgr_spec_high_2010.fits , source_spec_high_2010.fits were used to do the X-ray spectral analysis of the 2010 high state data. This spectrum is displayed in Figure 9 and was used in Figure 11 to show the spectral energy distribution.