B2_0619p33-20221230-S001-R001-B-233428.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-30 14:34:32.600
16.309 +/- 0.885 (3sigma)
15.730 +/- 0.887 (5sigma)
14.943 +/- 0.890 (10sigma)