FRB20190208A-20230102-S001-R001-R-175001.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-02 08:50:03.859
15.578 +/- 1.723 (3sigma)
14.877 +/- 1.728 (5sigma)
13.925 +/- 1.737 (10sigma)