Add GCN Circulars schema

gcn/circulars.example.json

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+{
+  "$schema": "https://gcn.nasa.gov/schema/main/gcn/circulars.schema.json",
+  "eventId": "GRB 230410A",
+  "submitter": "Fermi GBM Team at MSFC/Fermi-GBM <[email protected]>",
+  "submittedHow": "email-legacy",
+  "subject": "GRB 230410A: Fermi GBM Final Real-time Localization",
+  "circularId": 33603,
+  "format": "text/plain",
+  "body": "The Fermi GBM team reports the detection of a likely LONG GRB\\n\\nAt 11:26:00 UT on 10 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230410A (trigger 702818765.135562 / 230410476).\\n\\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 352.3, Dec = 22.9 (J2000 degrees, equivalent to J2000 23h 29m, 22d 53'), with a statistical uncertainty of 2.1 degrees.\\n\\nThe angle from the Fermi LAT boresight is 72.0 degrees.\\n\\nThe skymap can be found here:\\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230410476/quicklook/glg_skymap_all_bn230410476.png\\n\\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230410476/quicklook/glg_healpix_all_bn230410476.fit\\n\\nThe GBM light curve can be found here:\\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230410476/quicklook/glg_lc_medres34_bn230410476.gif",
+  "createdOn": 1718212589034
+}

gcn/circulars.schema.json

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+{
+  "$id": "https://gcn.nasa.gov/schema/main/gcn/circulars.schema.json",
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "type": "object",
+  "title": "GCN Circular",
+  "description": "GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See https://gcn.nasa.gov/circulars",
+  "properties": {
+    "eventId": {
+      "type": "string",
+      "description": "Event name, automatically inferred from the subject"
+    },
+    "submitter": {
+      "type": "string",
+      "description": "Name, affiliation, and email address of the person who submitted the Circular, in the form `A. E. Einstein at IAS <[email protected]>`"
+    },
+    "submittedHow": {
+      "enum": ["web", "email", "email-legacy", "api"],
+      "description": "Submission method"
+    },
+    "subject": {
+      "type": "string",
+      "description": "Subject line"
+    },
+    "circularId": {
+      "type": "number",
+      "description": "Circular ID assign in the GCN Ciculars archive. Increments by 1 for each published Circular"
+    },
+    "format": {
+      "enum": ["text/plain", "text/markdown"],
+      "description": "Format of the body text as a MIME type"
+    },
+    "body": { "type": "string", "description": "Body text" },
+    "createdOn": {
+      "type": "number",
+      "description": "Date accepted into GCN Circular archive as milliseconds since the UNIX epoch"
+    }
+  }
+}