FRB Schema for the CHIME Telescope

gcn/notices/chime/frb.detection.example.json

@@ -0,0 +1,25 @@
+{
+  "$schema": "https://gcn.nasa.gov/schema/main/gcn/notices/chime/frb.schema.json",
+  "alert_type": "initial",
+  "trigger_time": "2024-09-18T07:19:10.765268Z",
+  "trigger_time_error": [0.007864319719374001],
+  "id": ["427325191"],
+  "snr": 12.698559761047363,
+  "ra": 346.77850859547,
+  "dec": 12.632485229956252,
+  "ra_dec_error": [0.503806986334273, 0.598921231135782, 0],
+  "dm": 279.422607421875,
+  "dm_error": 0.40437427163124,
+  "dm_gal_ne_2001_max": 37.78909399600771,
+  "dm_gal_ymw_2016_max": 29.94072212814185,
+  "trigger_time_inf_freq": "2024-09-18 07:19:03.518831+00:00",
+  "trigger_time_inf_freq_error": 0.013108099559195993,
+  "importance": 0.9871308604784662,
+  "sampling_time": 0.983,
+  "spectrum": "wavelength",
+  "spectral_center": 600,
+  "bandwidth": 400,
+  "npol": 2,
+  "tsys": 50,
+  "description": "This alert was generated automatically by the CHIME/FRB Real-time Search Pipeline. Please direct comments, questions, and concerns to Thomas Abbott at [email protected]."
+}

gcn/notices/chime/frb.retraction.example.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://gcn.nasa.gov/schema/main/gcn/notices/chime/frb.schema.json",
+  "alert_type": "retraction",
+  "id": ["FRB 20231013B"],
+  "trigger_time": "2024-09-18T07:19:10.765268Z",
+  "trigger_time_error": [0.007864319719374001],
+  "description": "This alert was generated automatically by human-issued retraction. Please direct comments, questions, and concerns to Thomas Abbott at [email protected]."
+}

gcn/notices/chime/frb.schema.json

@@ -0,0 +1,64 @@
+{
+  "$id": "https://gcn.nasa.gov/schema/main/gcn/notices/chime/frb.schema.json",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "CHIME/FRB Alert",
+  "description": "Fast radio burst alert from the Canadian Hydrogen Intensity Mapping Experiment.",
+  "type": "object",
+  "allOf": [
+    { "$ref": "../core/Alert.schema.json" },
+    { "$ref": "../core/Reporter.schema.json" },
+    { "$ref": "../core/Event.schema.json" },
+    { "$ref": "../core/DateTime.schema.json" },
+    { "$ref": "../core/Localization.schema.json" }
+  ],
+  "properties": {
+    "known_source": {
+      "type": "string",
+      "description": "Transient Name Server name of the known source (if a repeating FRB source)"
+    },
+    "snr": {
+      "type": "number",
+      "description": "Signal-to-noise ratio of the burst [dimensionless]"
+    },
+    "dm_gal_ne_2001_max": {
+      "type": "number",
+      "description": "Estimated contribution to the dispersion measure from the Galaxy using the NE2001 model [pc/cm^3]"
+    },
+    "dm_gal_ymw_2016_max": {
+      "type": "number",
+      "description": "Estimated contribution to the dispersion measure from the Galaxy using the YMW2016 model [pc/cm^3]"
+    },
+    "trigger_time_inf_freq": {
+      "type": "string",
+      "description": "Time of the trigger at infinite frequency [ISO 8601]"
+    },
+    "trigger_time_inf_freq_error": {
+      "type": "number",
+      "description": "Error on the trigger time at infinite frequency [s]"
+    },
+    "importance": {
+      "type": "number",
+      "description": "A machine learning score separating RFI (0) from an astrophysical signal (1)"
+    },
+    "association_probability": {
+      "type": "number",
+      "description": "A score of known source association probability from poorly associated (0) to confidently associated (1)"
+    },
+    "bandwidth": {
+      "type": "number",
+      "description": "The bandwidth of the real-time FRB search [MHz]"
+    },
+    "npol": {
+      "type": "number",
+      "description": "The number of polarizations of the real-time FRB search"
+    },
+    "tsys": {
+      "type": "number",
+      "description": "The system temperature of the real-time FRB search [K]"
+    },
+    "update_message": {
+      "type": "string",
+      "description": "Message to be included in an update alert"
+    }
+  }
+}

gcn/notices/chime/frb.subsequent.example.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "https://gcn.nasa.gov/schema/main/gcn/notices/chime/frb.schema.json",
+  "alert_type": "subsequent",
+  "known_source": "FRB 20231013B",
+  "trigger_time": "2024-09-18T07:19:10.765268Z",
+  "trigger_time_error": [0.007864319719374001],
+  "id": ["FRB 20240918A"],
+  "snr": 12.698559761047363,
+  "ra": 346.77850859547,
+  "dec": 12.632485229956252,
+  "ra_dec_error": [0.503806986334273, 0.598921231135782, 0],
+  "dm": 279.422607421875,
+  "dm_error": 0.40437427163124,
+  "dm_gal_ne_2001_max": 37.78909399600771,
+  "dm_gal_ymw_2016_max": 29.94072212814185,
+  "trigger_time_inf_freq": "2024-09-18 07:19:03.518831+00:00",
+  "trigger_time_inf_freq_error": 0.013108099559195993,
+  "importance": 0.9871308604784662,
+  "association_probability": 0.932,
+  "sampling_time": 0.983,
+  "spectrum": "wavelength",
+  "spectral_center": 600,
+  "bandwidth": 400,
+  "npol": 2,
+  "tsys": 50,
+  "description": "This alert was generated automatically by the CHIME/FRB Real-time Search Pipeline. Please direct comments, questions, and concerns to Thomas Abbott at [email protected]."
+}

gcn/notices/chime/frb.update.example.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://gcn.nasa.gov/schema/main/gcn/notices/chime/frb.schema.json",
+  "alert_type": "update",
+  "id": ["FRB 20231013B"],
+  "trigger_time": "2024-09-18T07:19:10.765268Z",
+  "trigger_time_error": [0.007864319719374001],
+  "update_message": "The dispersion measure of FRB 20231013B has been updated to 221.19271850585938 +/- 0.40437427163124 pc/cm^3.",
+  "description": "This alert was generated automatically by human-issued retraction. Please direct comments, questions, and concerns to Thomas Abbott at [email protected]."
+}

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 [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 [pc/cm^3], representing the integrated column density of free electrons along the line of sight."
+    },
+    "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 [pc/cm^3] from the Galaxy using the NE2001 model."
+    }
+  }
+}

gcn/notices/core/Reporter.schema.json

@@ -27,6 +27,10 @@
       "type": "string",
       "default": "energy"
     },
+    "spectral_center": {
+      "description": "Central value of the observing band, should have same units as spectrum",
+      "type": "number"
+    },
     "units": {
       "enum": ["keV", "nm", "Hz"],
       "description": "Units of band range, if not parsed, then default energy is keV",

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@nasa-gcn/schema",
   "description": "Unified JSON Schema for multi-messenger and high-energy astronomy alerts",
-  "version": "4.2.0",
+  "version": "4.1.0",
   "repository": {
     "type": "git",
     "url": "github:nasa-gcn/gcn-schema"