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. Konus-Wind detection of GRB 250217C (short)
  2. GRB 250217C: Swift-XRT observations
  3. GRB 250217C: COLIBRÍ/DDRAGO Upper Limits on the Optical Counterpart
  4. GRB 250217C: DDOTI Upper Limits on the Optical Afterglow
  5. GRB 250217C: SVOM/GRM observation
  6. GRB 250217C: Tiled Swift observations
  7. GRB 250217C: Fermi GBM Observation
  8. IPN triangulation of GRB 250217C (short)
  9. GRB 250217C: AstroSat CZTI detection of a short burst
  10. Fermi GRB 250217C: Global MASTER-Net observations report
  11. GRB 250217C: Fermi GBM Final Real-time Localization

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