First - it's no big deal.
You can never be that far off your OG on an extract kit. My guess is that the top-up water was not well mixed when you took yout initial OG reading.
Take another gravity reading tomorrow or the next day, if it's still 1.015, rack/bottle it.
Originally Posted by david_42
only the $500,000 strippers can handle the load.
<Insert list of brews planned, fermenting, or being consumed here>