diff --git a/plenoirf/event_table/structure.py b/plenoirf/event_table/structure.py
index f85a9c4..dcf94d4 100644
--- a/plenoirf/event_table/structure.py
+++ b/plenoirf/event_table/structure.py
@@ -16,6 +16,8 @@ def init_table_structure():
     t["cherenkovsizepart"] = init_cherenkovsizepart_level_structure()
     t["cherenkovpoolpart"] = init_cherenkovpoolpart_level_structure()
 
+    t["core"] = init_core_level_structure()
+
     return t
 
 
@@ -203,6 +205,15 @@ def init_cherenkovpoolpart_level_structure():
     return init_cherenkovpool_level_structure()
 
 
+def init_core_level_structure():
+    return {
+        "bin_idx_x": {"dtype": "<i8", "comment": ""},
+        "bin_idx_y": {"dtype": "<i8", "comment": ""},
+        "core_x_m": {"dtype": "<f8", "comment": ""},
+        "core_y_m": {"dtype": "<f8", "comment": ""},
+    }
+
+
 """
 STRUCTURE = {}
 STRUCTURE["particlepool"] = {
@@ -274,13 +285,6 @@ def init_cherenkovpoolpart_level_structure():
     "bunch_size_median": {"dtype": "<f8", "comment": ""},
 }
 
-STRUCTURE["core"] = {
-    "bin_idx_x": {"dtype": "<i8", "comment": ""},
-    "bin_idx_y": {"dtype": "<i8", "comment": ""},
-    "core_x_m": {"dtype": "<f8", "comment": ""},
-    "core_y_m": {"dtype": "<f8", "comment": ""},
-}
-
 STRUCTURE["particlepoolonaperture"] = {
     "num_air_cherenkov_on_aperture": {
         "dtype": "<i8",
diff --git a/plenoirf/producing/__init__.py b/plenoirf/producing/__init__.py
index 5c8c553..143750d 100644
--- a/plenoirf/producing/__init__.py
+++ b/plenoirf/producing/__init__.py
@@ -478,6 +478,12 @@ def __corsika_and_grid(
                     )
                     del cherenkov_bunches_in_choice
 
+                    core_rec = make_core_record(
+                        uid=uid,
+                        groundgrid_result_choice=groundgrid_result["choice"],
+                    )
+                    tabrec["core"].append_record(core_rec)
+
                     EventTape_append_event(
                         evttar=evttar,
                         corsika_evth=corsika_evth,
@@ -650,6 +656,13 @@ def make_groundgrid_record(
     return rec
 
 
+def make_core_record(uid, groundgrid_result_choice):
+    rec = uid["record"].copy()
+    for key in event_table.init_core_level_structure():
+        rec[key] = groundgrid_result_choice[rec]
+    return rec
+
+
 def read_all_cherenkov_bunches(cherenkov_reader):
     return np.vstack([b for b in cherenkov_reader])