dispersion measure, center frequency and time resolution.

gcn/notices/core/DateTime.schema.json

@@ -15,6 +15,10 @@
       "maxItems": 2,
       "description": "Trigger time uncertainty [s, 1-sigma], with optional asymmetric uncertainty"
     },
+    "time_resolution": {
+      "type": "number",
+      "description": "Time resolution used for the source search, specified in milliseconds [ms]."
+    },
     "observation_start": {
       "type": "string",
       "description": "Start time of the observation [ISO 8601]"

gcn/notices/core/DispersionMeasure.schema.json

@@ -0,0 +1,23 @@
+{
+  "$id": "https://gcn.nasa.gov/schema/main/gcn/notices/core/DispersionMeasure.schema.json",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "title": "Schema for Radio Transients Observables",
+  "description": "Dispersion Measure schema used for radio transients",
+  "properties": {
+    "dm": {
+      "type": "number",
+      "description": "Dispersion measure (DM) of the burst, representing the integrated column density of free electrons along the line of sight [pc/cm^3]."
+    },
+    "dm_error": {
+      "type": "array",
+      "items": { "type": "number" },
+      "maxItems": 2,
+      "description": "Uncertainity associated with the dispersion measure [pc/cm^3, 1-sigma], with optional asymmetric uncertainty."
+    },
+    "dm_gal_ne_2001_max": {
+      "type": "number",
+      "description": "Estimated contribution to the dispersion measure from the Galaxy using the NE2001 model [pc/cm^3]."
+    }
+  }
+}

gcn/notices/core/Reporter.schema.json

@@ -27,6 +27,12 @@
       "type": "string",
       "default": "energy"
     },
+    "spectral_center": {
+      "enum": ["energy", "wavelength", "frequency"],
+      "description": "Central value of the observing band",
+      "type": "number",
+      "default": "energy"
+    },
     "units": {
       "enum": ["keV", "nm", "Hz"],
       "description": "Units of band range, if not parsed, then default energy is keV",