What is an 'objective, absolute truth'? It is a proposition that identifies facts of reality that are basic, universal, and inescapable.
Such a truth is objective because it identifies something that exists and is what it is independent of the proposition. If one states that the sun is shining today, and it is shining to today, the sun would be shining no matter who made the proposition or whether the proposition had been uttered at all. This view is known as the 'correspondence' theory of truth.
A truth is absolute if it states a fundamental, universal, and inescapable fact, a fact that holds no matter what other facts might also exist. Not every objective truth is absolute. The sun, after a time, will no longer shine. But all absolute truths are objective, else they would not be truths.