FRB20180916B-20221218-S001-R001-R-003103.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-18 15:31:06.580
16.518 +/- 1.000 (3sigma)
15.854 +/- 1.002 (5sigma)
14.952 +/- 1.007 (10sigma)