FRB20180916B-20221227-S001-R001-R-211356.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-27 12:13:58.250
16.557 +/- 0.670 (3sigma)
15.926 +/- 0.671 (5sigma)
15.071 +/- 0.674 (10sigma)