190907.J08+46-20230102-S001-R001-R-025837.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-02 17:58:39.978
16.573 +/- 1.051 (3sigma)
16.050 +/- 1.052 (5sigma)
15.341 +/- 1.055 (10sigma)