If that scratch doesn't penetrate the base coat (it looks like a base clear paint job) then you can just get some clear touchup paint and then buff it down after a week or two of drying. If it goes to the primer or base metal, you need some color and clear touchup.
Any chance they guys who painted it might mix you up a touchup bottle? I always have whoever paints my bikes, cars, etc fill a small bottle from the mix and that way I have a touchup paint the exact same as the paint job. It's worth at least calling and asking.
Other than that, you're going to have to try and match it to an already existing touch up paint, which never works out well. You can usually get close, but not exact.