Top row: the left panel shows a section of a VIS image acquired on 21 November 2023 centred on RA = 09^h59^m39.872^s, Dec = $+{02}^{\circ }{35}^{\mathrm{\prime }}{54}_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}129$ (J2000.0), the location of the SN candidate AT 2023adqt (internally called Euclid_SNT_2023B). It is close to the galaxy SDSS J095940.08+023554.6 (z = 0.246; Knobel et al. 2012), which is the likely host. The right panel shows this galaxy in a deep stacked image in the r-band obtained by the SUDARE program in 2011 using the VLT Survey Telescope (VST, Cappellaro et al. 2015). No source is visible on the SN position. Middle row: the SN candidate is clearly visible on two VIS I_E band images acquired on 21 November 2023 and 23 November 2023 as well as in the corresponding difference image. Bottom row: the SN candidate is not visible in the NISP J_E band image on 21 November 2023, but it appears on 23 November 2023. The difference image clearly shows the SN candidate.