FRB20190208A-20230101-S001-R001-R-174907.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2023-01-01 08:49:09.849
15.723 +/- 1.373 (3sigma)
15.066 +/- 1.377 (5sigma)
14.176 +/- 1.383 (10sigma)