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Near-Earth asteroids (NEAs) that may evolve into impactors deserve detailedthreat assessment studies. Early physical characterization of a would-beimpactor may help in optimizing impact mitigation plans. We first detected NEA2023~DZ$_{2}$ on 27--February--2023. After that, it was found to have a MinimumOrbit Intersection Distance (MOID) with Earth of 0.00005~au as well as anunusually high initial probability of becoming a near-term (in 2026) impactor.We aim to perform a rapid but consistent dynamical and physicalcharacterization of 2023~DZ$_{2}$ as an example of a key response to mitigatethe consequences of a potential impact. We use a multi-pronged approach,drawing from various methods (observational/computational) and techniques(spectroscopy/photometry from multiple instruments), and bringing the datatogether to perform a rapid and robust threat assessment.} The visiblereflectance spectrum of 2023~DZ$_{2}$ is consistent with that of an X-typeasteroid. Light curves of this object obtained on two different nights give arotation period $P$=6.2743$\pm$0.0005 min with an amplitude$A$=0.57$\pm$0.14~mag. We confirm that although its MOID is among the smallestknown, 2023~DZ$_{2}$ will not impact Earth in the foreseeable future as aresult of secular near-resonant behaviour. Our investigation shows thatcoordinated observation and interpretation of disparate data provides a robustapproach from discovery to threat assessment when a virtual impactor isidentified. We prove that critical information can be obtained within a fewdays after the announcement of the potential impactor.

Discovery and physical characterization as the first response to a potential asteroid collision: The case of 2023 DZ2