no good mate.
From what i can make of the pic (sorry my eye sight is not what it use to be) it must of been hit by something hard. Where the dent is, its a very strong part of the tank cos its on a fold\roll. I'd say its a ball or ur bike has been teabaged.
From what i know about panel repairs, u can either drill a whole in the tank and pull out the dent, then putty it up to fill the hole and get rid of the ripple that will be in the tank body. The other method is by using a welder like machine which will stick a rod to the tank and use a jig to pull the dent out.
Puttying & respraying is a must. U need to putty to get rid of the ripple and u need to spray the tank to get rid of the cracks in the paint. U can only spray the repaired area but u might have a problem with color matching, overspray etc etc.
When u need to get it done, give me a buzz, i can certianly point u in the right direction.