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Congrats Stu!
Hi Peter, Stu & All,
Add my congratulations on this discovery in one of my favourite southern edge-on galaxies Stu -- well done mate!
I observed this supernova up at Mudgee on 7 May 2011 at around 3am AEST with 46cm at x247 and visually it was a bit fainter, possibly a half magnitude fainter than the faint star (can't find a magnitude on this one) on-axis just inside the northern tip of the galaxy (see the image).
Averted vision job on the galaxy and the supernova -- the star at the tip was intermittent with direct vision. I'd reckon the visual magnitude on the supernova is probably low (faint) 15s. SQM-L reading about a 1/2 hour before was 21.52, very good seeing. Galaxy at about 30-odd degrees elevation. This is a very tough galaxy to observe due to its extremely LSB -- a fact that makes such a faint supernova easer to visually observe because of the lack of bright (well relatively so) background of the host galaxy.
Brian Skiff advises that the UCAC3 provides a magnitude for the star at the tip of the galaxy of ~15.5 -- putting 2001cb at low (faint) magnitude 15s or approximately mag 16 -- the faintest supernova I've ever observed so far (of about 10-odd).
Well done Stu and thanks for the spectacle!
Best,
Les D
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