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Increased luminosity of SN 2023ixf (M101 supernova) in 4 hours, pre-discovery (-18h), Bronco Oostermeyer

Increased luminosity of SN 2023ixf (M101 supernova) in 4 hours, pre-discovery (-18h)

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Description

I happened to image M101 on 2023-05-18 at ~21:40 UTC for 4h20m, around 18h pre-discovery. In this image I show 4 stacks of roughly 1h time frames. It shows the increased light intensity during this period. 
The four images are 25/25/26/26 subs stacked and drizzled 2x2.

The stacked result was posted in: 
https://www.astrobin.com/oddwjt/C/

The picture (and underlying data) also made it to TNS:
https://www.wis-tns.org/astronotes/astronote/2023-125

meanwhile my observation shows up in magnitude graphs:
image.png

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