190907.J08+46-20230101-S001-R001-R-011648.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-01 16:16:50.048
16.604 +/- 1.175 (3sigma)
16.084 +/- 1.176 (5sigma)
15.377 +/- 1.179 (10sigma)