AAVSO information :
https://www.aavso.org/news/t-crb-pre-eruption-dip

T Coronae Borealis Wikipedia
https://en.wikipedia.org/wiki/T_Coronae_Borealis

Old info. Sky & Telescope 2016
https://skyandtelescope.org/observing/whats-up-with-t-crb04202016/

Time: 22:16UT 2024-05-12 Exp.124 x 15sec
Telescope: 0.254m f/7.3 ST-10XME CCD 2x2bin 1.5"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.