FRB20190417A-20221230-S001-R001-R-190623.fts

upper limit SN vs magnitude graph from USNO-B1 catalog

UT upper limit 2022-12-30 10:06:25.949 15.291 +/- 1.235 (3sigma) 14.722 +/- 1.238 (5sigma) 13.950 +/- 1.242 (10sigma)