FRB20190417A-20221228-S001-R001-R-190015.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-28 10:00:17.338
15.101 +/- 1.563 (3sigma)
14.517 +/- 1.566 (5sigma)
13.724 +/- 1.572 (10sigma)