190907.J08+46-20230103-S001-R001-R-011317.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-03 16:13:19.660
16.481 +/- 1.106 (3sigma)
15.969 +/- 1.107 (5sigma)
15.274 +/- 1.110 (10sigma)