Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

11 results found.

  1. GRB 251111A: Mondy optical upper limit
  2. GRB 251111A: SVOM/ECLAIRs refined analysis
  3. GRB 251111A: Swift-XRT afterglow detection
  4. GRB 251111A: SVOM/VT optical observations with X-band data
  5. GRB 251111A: Swift-XRT observations
  6. GRB 251111A: EP-FXT counterpart detection
  7. GRB 251111A: SVOM/VT optical observations with VHF data
  8. GRB 251111A: KAIT optical upper limit
  9. GRB 251111A: LCO optical observation
  10. GRB 251111A: SVOM/COLIBRÍ (FM-GFT) optical counterpart detection
  11. GRB 251111A: SVOM detection of a soft burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov