Hi Stuart & All,
Maybe, just maybe it is Nibiru??
It does look very mono to me too and in colour, suspiciously like a green laser. But what did it reflect off? To be that bright in the image it would have to be close to the ground.
Probably too bright to be an internal reflection within the lens unless it came from an extremely bright light-source. Possible.
Cosmic Ray hit? It would have to be one mother of a particle that made it all the way through the atmosphere. Couldn't rule that out but very, very unlikely.
Could it be a head-on meteor? Meteors (particularly the big-uns) sometimes have a greenish hue because of either 1) Copper content and/or 2) ionisation of Oxygen (ie OIII) as they burn-up explode in the upper atmosphere.
The colour is about right (but probably a shade too light a green) for that but again, it looks awfully monochromatic and about mag -8 or -9 -- very, very bright.
GRB? For the optical afterglow to be that bright it would have to be pretty nearby and it'd be all over the scientific world today as the brightest GRB (in Gamma Rays) ever seen -- probably by several orders of magnitude. Swift would have picked it up. Can rule that one out I think.
I'd put the position approximately at RA 03 33 40 Dec -34 21 00. There are no even remotely close galaxies at that point. The closest Fornax member (excluding undiscovered ultra LSB dwarfs) is about 30 arcminutes away IC 335.
So what is it? Dunno -- but almost certainly has a mundane explanation.
Green laser is my bet at this stage as it is the "least unlikely".
Best,
Les D