Multiwavelength Properties of the Newly Discovered Dwarf Nova ASASSN-21kt

We report on archival XMM-Newton and post-outburst Swift observations of the newly discovered dwarf nova ASASSN-21kt. Its pre-outburst X-ray emission is consistent with that of a collisionally ionized, thermal plasma with ${kT}={8.1}_{-2.5}^{+10.2}$ keV and L_{X 0.2-12 keV} = 7 × 10³² erg s^-1, with no clear modulation. Multiple optical outbursts revealed by Gaia and time evolution of the last one followed by the All-Sky Automated Survey for Supernovae, and X-ray properties presented here support the dwarf nova classification of ASASSN-21kt.