Moving GUIbutton over an object that does not follow the player?

I would like to have a GUIbutton that stays over an object and does not move when the player moves, is this possible? I'm not sure exactly how to do that, as I have only made GUIbuttons that stay on screen when the player moves. Here is my current code:

 using UnityEngine;
 using System.Collections;
 
 public class DialoguerExampleStart : MonoBehaviour {
 private bool bShowGUI = false;
     void Awake(){
         // You must initialize Dialoguer before using it!
         Dialoguer.Initialize();
     }
     void OnTriggerEnter2D (Collider2D other){
                 if (other.tag == "Player") {
                         bShowGUI = true;
                 }
         }
     void OnTriggerExit2D (Collider2D other) {
                 if (other.tag == "Player") {
                         bShowGUI = false;
                 }
         }
     void OnGUI(){
                 if (bShowGUI) {
                         if (GUI.Button (new Rect (640, 290, 100, 30), "Investigate")) {
 
                                 Dialoguer.StartDialogue (0);
 
                         }
                 }