FRB20190208A-20230103-S001-R001-R-175608.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-03 08:56:10.089
15.867 +/- 1.184 (3sigma)
15.223 +/- 1.187 (5sigma)
14.350 +/- 1.192 (10sigma)