Vend82: independent discovery of AT 2026xf

I've just found a bright possible nova on my 4×90 s images of M31 taken on 2026 Jan 13.8280 UT with the 0.43 m CDK at Alnitak Remote Observatory. It was already faintly visible in the green channel of my 6×120 s colour images obtained with the 0.28 m RASA telescope at UDRO on 2026 Jan 12.3102 UT. This appears to be an independent detection of the transient AT 2026xf.

Unfortunately, the XOSS team discovered it approximately 8 hours before my observations with the 0.43 m CDK.

The discovery image (reference image subtracted).
 
Prediscovery image made with the 28cm RASA at UDRO (green channel).

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