FRB20190222A-20221219-S001-R001-R-195452.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-19 10:54:54.829
16.030 +/- 1.504 (3sigma)
15.406 +/- 1.508 (5sigma)
14.559 +/- 1.514 (10sigma)