FRB20180916B-20230102-S001-R001-R-210033.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-02 12:00:34.978
16.299 +/- 0.854 (3sigma)
15.658 +/- 0.856 (5sigma)
14.787 +/- 0.860 (10sigma)