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We present the results of a coordinated campaign to simultaneously observethe M star binary Ross 733 simultaneously in the optical and near-ultraviolet(NUV) with TESS and Swift respectively. We observed two flares in the Swift NUVlight curve. One of these was decay phase of a flare that was also detectedwith TESS and the other was only detected in the NUV. We used the TESS lightcurve to measure the white-light flare rate of Ross 733, and calculate that thesystem flares with an energy of $10^{33}$ erg once every 1.5 days. We used oursimultaneous observations to measure a pseudo-continuum temperature of$7340^{+810}_{-900}$K during the flare decay. We also used our observations totest the NUV predictions of the 9000 K blackbody flare model, and find that itunderestimates number of flares we detect in our Swift NUV light curve. Wediscuss the reasons for this and attribute it to the unaccounted contributionsfrom emission lines and continuum temperatures above 9000 K. We discuss howadditional observations are required to break the degeneracy between the two infuture multi-wavelength flare campaigns.

Characterisation of the NUV and Optical Emission and Temperature of Flares from Ross 733 with Swift and TESS