What is Hamlet's response to the news from Horatio, Marcellus, and Bernardo?

At first, Hamlet is too aggrieved to recognize Horatio, his old school friend, but finally he welcomes Horatio warmly. After chatting about the state, Horatio tells Hamlet that he has seen his dead father recently – the night before. Hamlet asks him to explain, and Horatio tells the story of the appearance of the ghost. Hamlet decides to attend the watch that very night in hopes of seeing the ghost himself.