after careful scrutanising i'm swaying more towards mongoose!
the logo at the top of the drop out looks the wrong shape to be gt, mongoose were stamping a logo there back in the late 90's. the logo on the top of the seat looks mongoose,
if you google an image of a 98 dmc the seatstays are exactly the same shape.
can't pin point the model though. was thinking fuzzy to begin with but can't remember whether it had v brake mounts, which leans me to one of their base models perhaps, menace maybe?