B2_1520p31-20210221-S001-R001-B-050807.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2021-02-21 20:08:09
17.793 +/- 1.280 (3sigma)
17.172 +/- 1.282 (5sigma)
16.329 +/- 1.287 (10sigma)


B2_1520p31-20210221-S001-R001-I-051158.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2021-02-21 20:11:59
16.059 +/- 1.873 (3sigma)
15.480 +/- 1.877 (5sigma)
14.695 +/- 1.883 (10sigma)


B2_1520p31-20210221-S001-R001-R-051042.fts
upper limit SN vs magnitude graph from USNO-B1 catalog
UT upper limit
2021-02-21 20:10:43
16.649 +/- 1.410 (3sigma)
16.078 +/- 1.412 (5sigma)
15.302 +/- 1.417 (10sigma)


B2_1520p31-20210221-S001-R001-V-050924.fts
Only less than 50 stars was detected