ZTF data show a deep fade of EPIC 204278916 in two filters on 27 April 2022

We tested public ZTF DR24 data for deep fades of the known dipper star EPIC 204278916. On 27 April 2022, its measured g and r fluxes were 55.7% and 44.3% below a local reference. The reference is the median outside one day of the event, within 30 days on each side. We used 31 g control stars and 46 r control stars to correct each exposure. These stars do not show the target fade. Direct aperture measurements on six science images confirm the loss. Changes to the reference window and aperture radius retain a deep fade. The exposures are 69.93 minutes apart. The apparent depth difference can result from time variation, so it does not establish a colour change. The data do not establish a planet, a period, or an extinction law. This study adds a checked event date to the record of this star. The package includes the input data, exact archive requests, source code, figures, results, and reproduction instructions.

EPIC 204278916 · ZTF DR24 · dipper stars · stellar variability · aperture photometry · public astronomical data