FRB20190222A-20230101-S001-R001-R-194441.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-01 10:44:44.060
15.992 +/- 1.044 (3sigma)
15.422 +/- 1.045 (5sigma)
14.649 +/- 1.049 (10sigma)