# 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. An archive of all GCN Circulars can be found at https://gcn.nasa.gov/circulars

# properties.eventId.description
Event name, automatically inferred from the subject

# properties.submitter.description
Name, affiliation, and email address of the person who submitted the Circular, in the form `A. E. Einstein at IAS <albert.einstein@example.edu>`

# properties.submittedHow.description
Specifies the method by which the user submitted the Circular

# properties.circularId.description
Circular ID assigned to the Circular in the GCN Circulars archive. This value is unique to each published Circular and increments by 1

# properties.format.description
Format of the body text as a MIME type. See https://gcn.nasa.gov/docs/circulars/markdown for documentation on using Markdown in Circulars

# properties.createdOn.description
Date and time the Circular is accepted and published onto the GCN Circulars archive, formatted as a UNIX timestamp (milliseconds since the UNIX epoch)