The Conference club stunned the Canaries at Carrow Road.
Hughton admitted: "It's right up there, yes.
"Our form has taken a real dip and we're in a difficult place at the moment.
"The scoreline is a reflection of that. As manager I take full responsibility - it's an awful day for us.
"I had a team out there who were good enough to win but I don't want to take anything away from Luton."