hoodie,
Given the modest resolution of the picture, and the unknown color of the underside of the boat tail, it's not impossible it's an X47. To be more sure you'd need to blur the image using the resolution response of the camera against a bright sky background, and include the effects of the uncertain elevation to the aircraft, which makes it appear shortened in the wingspan direction than if it was directly overhead, and so makes the wing sweep angle appear greater than it is.