FRB20190222A-20221230-S001-R001-R-195522.fts

upper limit SN vs magnitude graph from USNO-B1 catalog

UT upper limit 2022-12-30 10:55:24.480 15.706 +/- 1.355 (3sigma) 15.137 +/- 1.357 (5sigma) 14.364 +/- 1.362 (10sigma)