(NEW) ATel 16925: Optical spectrum of the BL Lac object 4FGL J1824.1+5651 (4C +56.27... https://www.astronomerstelegram.org/?read=16925
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(NEW) ATel 16925: Optical spectrum of the BL Lac object 4FGL J1824.1+5651 (4C +56.27... https://www.astronomerstelegram.org/?read=16925