B2_1520p31-20200403-S001-R001-B-022456.fts

Only less than 50 stars was detected

B2_1520p31-20200403-S001-R001-I-022854.fts

upper limit SN vs magnitude graph from USNO-B1 catalog

UT upper limit 2020-04-03 17:28:56

B2_1520p31-20200403-S001-R001-R-022737.fts

upper limit SN vs magnitude graph from USNO-B1 catalog

UT upper limit 2020-04-03 17:27:38

B2_1520p31-20200403-S001-R001-V-022616.fts

Only less than 50 stars was detected