The extragalactic slow nova AT 2023oom (Vend51) has been significantly brightening at an accelerated rate in the last few days! Tamás Tordai measured it at 18,464CV yesterday evening, recent ZTF data show it at 18.294r this morning. Photometry by Tamás Tordai: AT2023oom 2460305.28908 18.782CV (0.076) AT2023oom 2460311.36725,18.464CV (0.068) AT2023oom 2460309.38930 18.472CV (0.067) ZTF light curve: https://alerce.online/object/ZTF23aatzhso Clear skies, Robert Fidrich HAA/VSS