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"

12 results found.

  1. GRB 240222A: ATCA radio observations
  2. GRB 240222A: GRBAlpha detection
  3. GRB 240222A: GECAM detection of a burst
  4. GRB 240222A: Swift-BAT refined analysis
  5. GRB 240222A: Swift-XRT refined Analysis
  6. GRB 240222A: Fermi GBM Observation
  7. GRB 240222A: Swift/UVOT Upper Limits
  8. Swift GRB 240222A: Global MASTER-Net observations report
  9. Fermi GRB 240222A: Global MASTER-Net observations report
  10. GRB 240222A: REM optical and NIR early-time observations
  11. GRB 240222A: Swift detection of a burst
  12. GRB 240222A: 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