V551 Sgr possible superoutburst (Known SU UMa star. Combined magnitudes for ASAS-SN DB) YYYYMMDD(UT) mag observer 20230615.0667 15.844g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230616.0527 15.721g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230616.6708 146C (Masayuki Moriyama) 20230617.2630 14.262g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))