FRB20190222A-20230102-S001-R001-R-193835.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-02 10:38:37.399
16.012 +/- 1.425 (3sigma)
15.365 +/- 1.429 (5sigma)
14.487 +/- 1.435 (10sigma)