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4U 1543--47 is one of a handful of known black hole candidates located in theMilky Way Galaxy, and has undergone a very bright outburst in 2021, reaching atotal of $\sim$9 Crab, as observed by the Monitor of All-sky Image (MAXI), andexceeding twice its Eddington luminosity. The unprecedented bright outburst of4U 1543--47 provides a unique opportunity to test the behavior of accretiondisk models at high luminosities and accretion rates. In addition, we explorethe possibility of constraining the spin of the source at high accretion rates,given that previous spin measurements of 4U 1543--47 have been largelyinconsistent with each other. We measure the spectral evolution of the sourcethroughout its outburst as observed by Insight-HXMT, and compare the behaviorof both the thin disk model kerrbb2, as well as the slim disk model slimbh upto the Eddington limit for two different values of disk $\alpha$-viscosity. Inaddition, given the behavior of these two models, we identify two `golden'epochs for which it is most suitable to measure the spin with continuumfitting.

Spin measurement of 4U 1543-47 with Insight-HXMT and NICER from its 2021 outburst: A test of accretion disk models at high luminosities