FRB20180916B-20221230-S001-R001-R-212421.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-30 12:24:23.629
16.477 +/- 0.668 (3sigma)
15.853 +/- 0.670 (5sigma)
15.006 +/- 0.672 (10sigma)