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Looks like that figure of 14.1 magn. might be from Joseph Brimacombe, whose image of the SN is at //www.rochesterastronomy.org/snimages
I have no idea what wavelength band this magnitude was measured in (this could make all the difference). It almost looked like it could be in the J-band, which is NIR (no use to visual observers)
Surely these SN blokes know that when we measure magns of supernovae, we have to "compare apples with apples"
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