Mrk_501-20210418-S001-R001-B-025424.fts

Only less than 50 stars was detected

Mrk_501-20210418-S001-R001-I-025812.fts

relative photometry graph from USNO-B1 catalog

Date UT magnitude mag_erorr 2021-04-18 17:58:13 14.28 0.015

Mrk_501-20210418-S001-R001-R-025657.fts

relative photometry graph from USNO-B1 catalog

Date UT magnitude mag_erorr 2021-04-18 17:56:58 13.41 0.015

Mrk_501-20210418-S001-R001-V-025542.fts