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Upper panel: Host-subtracted photometry of OGLE17aaj in the OGLE-IV I and V bands and the Swift UVW1 and UVW2 bands in absolute magnitudes as a function of days since maximum. Lower panel: Temperature evolution derived from Swift ultraviolet data over the same period. Credit: Gromadzki et al., 2019.

Astronomers discover an unusual nuclear transient

An international group of astronomers has detected an unusual nuclear transient in the nucleus of a weakly active galaxy.