Images were taken on the night of 2024-04-22 local time from the University of
Louisville Manner Telescope on Mt. Lemmon to calibrate photometry using a 
blackbody absolute reference star 109 Vir (HD 30109)

Sloan filters g', r', i', and z'
ASI 6200 CMOS camera
Exposures from 0.005 to 0.02 seconds


Coordinates are added from Astrometry.net processing

The images are dark-subtracted with bias frame but not flat-fielded


File: hd130109_20240422_GP_00000209_d.fits  Exposure: 0.005
File: hd130109_20240422_GP_00000210_d.fits  Exposure: 0.005
File: hd130109_20240422_IP_00000211_d.fits  Exposure: 0.005
File: hd130109_20240422_RP_00000206_d.fits  Exposure: 0.002
File: hd130109_20240422_RP_00000207_d.fits  Exposure: 0.02
File: hd130109_20240422_RP_00000208_d.fits  Exposure: 0.005
File: hd130109_20240422_ZP_00000212_d.fits  Exposure: 0.005

Use the 5-millisecond exposures and integrate over the seeing to get relative
responses in the filter bands.  The colors of 109 Vir should be "0" in any
filter pair, and  a magnitude  of 3.79 +/- 0.01 in any visible or near-infrared
filter.