Marchini, AlessandroAlessandroMarchiniAceti, PietroPietroAcetiBanfi, MassimoMassimoBanfiMortari, FabioFabioMortariPapini, RiccardoRiccardoPapiniSalvaggio, FabioFabioSalvaggioMarino, GiuseppeGiuseppeMarinoARENA, CLAUDIOCLAUDIOARENA0000-0002-0319-8791FRASCA, AntonioAntonioFRASCA0000-0002-0474-0896Conti, MassimoMassimoContiLeonini, SimoneSimoneLeoniniRosi, PaoloPaoloRosiRamirez, Luz Marina TinjacaLuz Marina TinjacaRamirezBONNOLI, GiacomoGiacomoBONNOLI0000-0003-2464-90772022-06-072022-06-072021http://hdl.handle.net/20.500.12386/32204We report that the optical brightness of the flaring blazar BL Lacertae (RA: 22 02 43.29 Dec: +42 16 39.98 J2000.0) reached levels that are unprecedented for this source to the best of our knowledge, with observed magnitudes below R=11.5.ELETTRONICOenMagazine articlehttps://www.astronomerstelegram.org/?read=143282021ATel14328....1MFIS/05 - ASTRONOMIA E ASTROFISICA