U Gem: preoutburst brightening?

Preoutburst brightening had been suggested.

YYYYMMDD(UT) mag observer 20221123.783 136 (Tsuneo Horie) 20221124.7293 135cG (Yutaka Maeda) 20221126.617 <131 (Tsuneo Horie) 20221126.628 <139 (Takuichiro Onishi) 20221126.719 138 (Hiroyuki Maehara) 20221126.7296 133cG (Yutaka Maeda) 20221126.8938 133C (Masayuki Moriyama) 20221127.8938 139C (Masayuki Moriyama) 20221128.085 13.66C (Gary Poyner) 20221128.0862 13.58C (Masao Funada) 20221129.012 13.70 (Pavol A. Dubovsky) 20221129.944 14.03 (Pavol A. Dubovsky) 20221201.115 14.00 (Pavol A. Dubovsky) 20221201.665 135 (Takuichiro Onishi) 20221202.625 <131 (Takuichiro Onishi) 20221202.8751 137C (Masayuki Moriyama) 20221203.556 <131 (Takuichiro Onishi) 20221203.805 135 (Tsuneo Horie) 20221205.7475 132cG (Yutaka Maeda) 20221207.585 <109 (Hiroyuki Someya) 20221207.7173 138:cG (Yutaka Maeda) 20221207.791 <131 (Tsuneo Horie) 20221208.616 <120 (Takuichiro Onishi) 20221208.7100 144:c (Yutaka Maeda) 20221209.569 <120 (Takuichiro Onishi) 20221209.7363 140cG (Yutaka Maeda) 20221212.8854 94 (Eddy Muyllaert) 20221213.781 95 (Tsuneo Horie)