FRB20190417A-20230103-S001-R001-R-185524.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-03 09:55:26.750
15.523 +/- 1.092 (3sigma)
14.949 +/- 1.094 (5sigma)
14.171 +/- 1.098 (10sigma)