FRB20190417A-20221226-S001-R001-R-190651.fts

upper limit SN vs magnitude graph from USNO-B1 catalog

UT upper limit 2022-12-26 10:06:53.329 14.537 +/- 1.987 (3sigma) 14.020 +/- 1.990 (5sigma) 13.319 +/- 1.997 (10sigma)