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AT 2019abn was discovered in the nearby M51 galaxy by the Zwicky TransientFacility at more than two magnitudes and around three weeks prior to itsoptical peak. We aim to conduct a detailed photometric and spectroscopicfollow-up campaign for AT 2019abn, with early discovery allowing forsignificant pre-maximum observations of an intermediate luminosity redtransient (ILRT) for the first time. This work is based on the analysis ofu'BVi'z'H photometry and low-resolution spectroscopy using the LiverpoolTelescope, medium-resolution spectroscopy with the Gran Telescopio Canarias(GTC), and near-infrared imaging with the GTC and the Nordic Optical Telescope.We present the most detailed optical light curve of an ILRT to date, withmulti-band photometry starting around three weeks before peak brightness. Thetransient peaked at an observed absolute magnitude of M_r' = -13.1, although itis subject to significant reddening from dust in M51, implying an intrinsicM_r' ~ -15.2. The initial light curve showed a linear, achromatic rise inmagnitude before becoming bluer at peak. After peak brightness, the transientgradually cooled. This is reflected in our spectra, which at later times showabsorption from such species as Fe I, Ni I and Li I. A spectrum taken aroundpeak brightness shows narrow, low-velocity absorption lines, which we interpretas likely to originate from pre-existing circumstellar material. We concludethat while there are some peculiarities, such as the radius evolution, AT2019abn fits in well overall with the ILRT class of objects and is the mostluminous member of the class seen to date.

AT 2019abn: multi-wavelength observations over the first 200 days