Unprecedented X-ray Emission from the Fast Blue Optical Transient AT2022tsd

D. J. Matthews, R. Margutti, B. D. Metzger +8

We present the X-ray monitoring campaign of AT2022tsd in the time range $\delta t_{rest}=23-116$ d rest-frame since discovery. With an initial 0.3-10 keV X-ray luminosity of $L_x \ap…