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We present early-phase panchromatic photometric and spectroscopic coveragespanning far-ultraviolet (FUV) to the near-infrared (NIR) regime of the nearesthydrogen-rich core-collapse supernova in the last 25 years, SN 2023ixf. Weobserve early 'flash' features in the optical spectra due to a confined densecircumstellar material (CSM). We observe high-ionization absorption lines(FeII, MgII) in the ultraviolet spectra from very early on. We also observe amulti-peaked emission profile of H-alpha in the spectrum beginning ~16 d, whichindicates ongoing interaction of the SN ejecta with a pre-existing shell-shapedCSM having an inner radius of ~75 AU and an outer radius of ~140 AU. Theshell-shaped CSM is likely a result of enhanced mass loss ~35-65 years beforethe explosion assuming a standard Red-Supergiant wind. The UV spectra aredominated by multiple highly ionized narrow absorption features and broademission features from elements such as C, N, O, Si, Fe, and Ni. Based on earlylight curve models of Type II SNe, we infer that the nearby dense CSM confinedto (7+-3)e14cm (~45 AU) is a result of enhanced mass loss (10^{-3.0+-0.5}Msol/yr) two decades before the explosion.

Far-Ultraviolet to Near-Infrared Observations of SN 2023ixf: A high energy explosion engulfed in complex circumstellar material