OJ_248-20210311-S001-R001-I-225557.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2021-03-11 13:55:58
15.532 +/- 4.189 (3sigma)
14.615 +/- 4.208 (5sigma)
13.370 +/- 4.245 (10sigma)