Add RAVEN VOEvent variant

gracedb/events/models.py

@@ -1008,6 +1008,23 @@ class VOEventBase(CleanSaveModel):
         validators=[models.fields.validators.MinValueValidator(0.0),
         models.fields.validators.MaxValueValidator(1.0)])
 
+    # Additional RAVEN Fields
+    ext_gcn = models.CharField(max_length=20, default="", blank=True,
+        editable=False)
+    ext_pipeline = models.CharField(max_length=20, default="", blank=True,
+        editable=False)
+    ext_search = models.CharField(max_length=20, default="", blank=True,
+        editable=False)
+    time_coinc_far = models.FloatField(null=True, default=None, blank=True,
+        validators=[models.fields.validators.MinValueValidator(0.0)])
+    space_coinc_far = models.FloatField(null=True, default=None, blank=True,
+        validators=[models.fields.validators.MinValueValidator(0.0)])
+    comb_skymap_filename = models.CharField(max_length=100, null=True,
+        default=None, blank=True)
+    delta_t = models.FloatField(null=True, default=None, blank=True,
+        validators=[models.fields.validators.MinValueValidator(-1000),
+        models.fields.validators.MaxValueValidator(1000)])
+
     def fileurl(self):
         # Override this method on derived classes
         return NotImplemented