FRB20180916B-20230103-S001-R001-R-211525.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-03 12:15:27.178
15.933 +/- 1.189 (3sigma)
15.265 +/- 1.192 (5sigma)
14.358 +/- 1.197 (10sigma)