B2_1520p31-20210227-S001-R001-B-045318.fts
Only less than 50 stars was detected


B2_1520p31-20210227-S001-R001-I-045709.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2021-02-27 19:57:10
15.899 +/- 2.293 (3sigma)
15.309 +/- 2.297 (5sigma)
14.509 +/- 2.305 (10sigma)


B2_1520p31-20210227-S001-R001-R-045553.fts
Only less than 50 stars was detected


B2_1520p31-20210227-S001-R001-V-045437.fts
Only less than 50 stars was detected