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             // version's entry
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diff --git a/docs/dev/_modules/gammapy/astro/population/velocity.html b/docs/dev/_modules/gammapy/astro/population/velocity.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/astro/source/pulsar.html b/docs/dev/_modules/gammapy/astro/source/pulsar.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/astro/source/pwn.html b/docs/dev/_modules/gammapy/astro/source/pwn.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/astro/source/snr.html b/docs/dev/_modules/gammapy/astro/source/snr.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/catalog/core.html b/docs/dev/_modules/gammapy/catalog/core.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/catalog/fermi.html b/docs/dev/_modules/gammapy/catalog/fermi.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/catalog/gammacat.html b/docs/dev/_modules/gammapy/catalog/gammacat.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/catalog/hawc.html b/docs/dev/_modules/gammapy/catalog/hawc.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/catalog/hess.html b/docs/dev/_modules/gammapy/catalog/hess.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/catalog/lhaaso.html b/docs/dev/_modules/gammapy/catalog/lhaaso.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/data_store.html b/docs/dev/_modules/gammapy/data/data_store.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/event_list.html b/docs/dev/_modules/gammapy/data/event_list.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/filters.html b/docs/dev/_modules/gammapy/data/filters.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/gti.html b/docs/dev/_modules/gammapy/data/gti.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/hdu_index_table.html b/docs/dev/_modules/gammapy/data/hdu_index_table.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/obs_table.html b/docs/dev/_modules/gammapy/data/obs_table.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {

diff --git a/docs/dev/_modules/gammapy/data/observations.html b/docs/dev/_modules/gammapy/data/observations.html
@@ -188,7 +188,7 @@
 
             $("#version_switcher_menu").append(node);
             // replace dropdown button text with the preferred display name of
-            // this version, rather than using sphinx's 1.2.dev453+g5764a25fc variable.
+            // this version, rather than using sphinx's 1.2.dev467+g738109e43 variable.
             // also highlight the dropdown entry for the currently-viewed
             // version's entry
             if (entry.version == "dev") {
@@ -266,6 +266,7 @@ <h1>Source code for gammapy.data.observations</h1><div class="highlight"><pre>
 <span class="kn">import</span> <span class="nn">collections.abc</span>
 <span class="kn">import</span> <span class="nn">copy</span>
 <span class="kn">import</span> <span class="nn">inspect</span>
+<span class="kn">import</span> <span class="nn">itertools</span>
 <span class="kn">import</span> <span class="nn">logging</span>
 <span class="kn">import</span> <span class="nn">warnings</span>
 <span class="kn">from</span> <span class="nn">itertools</span> <span class="kn">import</span> <span class="n">zip_longest</span>
@@ -885,7 +886,9 @@ <h1>Source code for gammapy.data.observations</h1><div class="highlight"><pre>
 <span class="sd">    &quot;&quot;&quot;</span>
 
     <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">observations</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
-        <span class="bp">self</span><span class="o">.</span><span class="n">_observations</span> <span class="o">=</span> <span class="n">observations</span> <span class="ow">or</span> <span class="p">[]</span>
+        <span class="bp">self</span><span class="o">.</span><span class="n">_observations</span> <span class="o">=</span> <span class="p">[]</span>
+        <span class="k">for</span> <span class="n">obs</span> <span class="ow">in</span> <span class="n">observations</span><span class="p">:</span>
+            <span class="bp">self</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">obs</span><span class="p">)</span>
 
     <span class="k">def</span> <span class="fm">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">):</span>
         <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_observations</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">key</span><span class="p">)]</span>
@@ -895,12 +898,20 @@ <h1>Source code for gammapy.data.observations</h1><div class="highlight"><pre>
 
     <span class="k">def</span> <span class="fm">__setitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">obs</span><span class="p">):</span>
         <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obs</span><span class="p">,</span> <span class="n">Observation</span><span class="p">):</span>
+            <span class="k">if</span> <span class="n">obs</span> <span class="ow">in</span> <span class="bp">self</span><span class="p">:</span>
+                <span class="n">log</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span>
+                    <span class="sa">f</span><span class="s2">&quot;Observation with obs_id </span><span class="si">{</span><span class="n">obs</span><span class="o">.</span><span class="n">obs_id</span><span class="si">}</span><span class="s2"> already belongs to Observations.&quot;</span>
+                <span class="p">)</span>
             <span class="bp">self</span><span class="o">.</span><span class="n">_observations</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">key</span><span class="p">)]</span> <span class="o">=</span> <span class="n">obs</span>
         <span class="k">else</span><span class="p">:</span>
             <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Invalid type: </span><span class="si">{</span><span class="nb">type</span><span class="p">(</span><span class="n">obs</span><span class="p">)</span><span class="si">!r}</span><span class="s2">&quot;</span><span class="p">)</span>
 
 <div class="viewcode-block" id="Observations.insert"><a class="viewcode-back" href="../../../api/gammapy.data.Observations.html#gammapy.data.Observations.insert">[docs]</a>    <span class="k">def</span> <span class="nf">insert</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">idx</span><span class="p">,</span> <span class="n">obs</span><span class="p">):</span>
         <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obs</span><span class="p">,</span> <span class="n">Observation</span><span class="p">):</span>
+            <span class="k">if</span> <span class="n">obs</span> <span class="ow">in</span> <span class="bp">self</span><span class="p">:</span>
+                <span class="n">log</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span>
+                    <span class="sa">f</span><span class="s2">&quot;Observation with obs_id </span><span class="si">{</span><span class="n">obs</span><span class="o">.</span><span class="n">obs_id</span><span class="si">}</span><span class="s2"> already belongs to Observations.&quot;</span>
+                <span class="p">)</span>
             <span class="bp">self</span><span class="o">.</span><span class="n">_observations</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="n">idx</span><span class="p">,</span> <span class="n">obs</span><span class="p">)</span>
         <span class="k">else</span><span class="p">:</span>
             <span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;Invalid type: </span><span class="si">{</span><span class="nb">type</span><span class="p">(</span><span class="n">obs</span><span class="p">)</span><span class="si">!r}</span><span class="s2">&quot;</span><span class="p">)</span></div>
@@ -977,7 +988,25 @@ <h1>Source code for gammapy.data.observations</h1><div class="highlight"><pre>
                 <span class="p">[</span><span class="n">obs</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">obs</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="k">if</span> <span class="n">labels</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">==</span> <span class="n">label</span><span class="p">]</span>
             <span class="p">)</span>
             <span class="n">obs_groups</span><span class="p">[</span><span class="sa">f</span><span class="s2">&quot;group_</span><span class="si">{</span><span class="n">label</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">]</span> <span class="o">=</span> <span class="n">observations</span>
-        <span class="k">return</span> <span class="n">obs_groups</span></div></div>
+        <span class="k">return</span> <span class="n">obs_groups</span></div>
+
+<div class="viewcode-block" id="Observations.from_stack"><a class="viewcode-back" href="../../../api/gammapy.data.Observations.html#gammapy.data.Observations.from_stack">[docs]</a>    <span class="nd">@classmethod</span>
+    <span class="k">def</span> <span class="nf">from_stack</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">observations_list</span><span class="p">):</span>
+        <span class="c1"># TODO : Do more check when stacking observations when we have metadata.</span>
+<span class="w">        </span><span class="sd">&quot;&quot;&quot;Create a new `Observations` instance by concatenating a list of `Observations` objects.</span>
+
+<span class="sd">        Parameters</span>
+<span class="sd">        ----------</span>
+<span class="sd">        observations_list : list of `~gammapy.data.Observations`</span>
+<span class="sd">            The list of `Observations` to stack.</span>
+
+<span class="sd">        Returns</span>
+<span class="sd">        -------</span>
+<span class="sd">        observations : `~gammapy.data.Observations`</span>
+<span class="sd">            The `Observations` object resulting from the stacking of all the `Observations` in `observation_list`.</span>
+<span class="sd">        &quot;&quot;&quot;</span>
+        <span class="n">obs</span> <span class="o">=</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="o">*</span><span class="n">observations_list</span><span class="p">)</span>
+        <span class="k">return</span> <span class="bp">cls</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">obs</span><span class="p">))</span></div></div>
 
 
 <span class="k">class</span> <span class="nc">ObservationChecker</span><span class="p">(</span><span class="n">Checker</span><span class="p">):</span>