190907.J08+46-20221215-S001-R001-R-032938.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-15 18:29:40.780
16.564 +/- 1.155 (3sigma)
16.028 +/- 1.156 (5sigma)
15.300 +/- 1.160 (10sigma)