From 75b264f7e5968e3503198c1cc10dfa5ec842ce13 Mon Sep 17 00:00:00 2001
From: Michael Mayer <michael.mayer@desy.de>
Date: Wed, 13 Feb 2013 14:57:34 +0100
Subject: [PATCH] incorporated change request 752

---
 src/ctmodel/ctmodel.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ctmodel/ctmodel.cpp b/src/ctmodel/ctmodel.cpp
index ba2e0fc..04f4125 100644
--- a/src/ctmodel/ctmodel.cpp
+++ b/src/ctmodel/ctmodel.cpp
@@ -582,10 +582,13 @@ void ctmodel::setup_obs(void)
                 throw GException::no_cube(G_SETUP_OBS);
             }
         
-            // Set response
-            obs->response(m_irf, m_caldb);
+            // Set response if it isn't set already
+            if (obs->response() == NULL) {
+            	obs->response(m_irf, m_caldb);
+            } // endif: observation already has a response
 
         } // endif: observation was a CTA observation
+
     } // endfor: looped over all observations
 
     // Return
--
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