A summons is an order from the court to appear. It might be as a witness, as a defendant, or even as a juror.
An arrest warrant is an order from the court authorizing the police to arrest you.
If the police ask you to come to the station to be booked it implies that there's an arrest warrant out on you, but that you're being given the option of coming in to let them serve it on you at the station, rather than them coming to your home or business and serving it on you there.
If they're willing to notify you, and ask you to come in, then it suggests that they don't consider you a flight risk, so there's a good chance that following booking you might be released "Own Recognizance"..... BUT do not just assume that.
If you're going in to be arrested and booked you should ALWAYS have a lawyer with you.