FRB20190222A-20221231-S001-R001-R-194054.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2022-12-31 10:40:56.368
15.857 +/- 1.662 (3sigma)
15.197 +/- 1.666 (5sigma)
14.300 +/- 1.674 (10sigma)