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"

16 results found.

  1. Radio observation of GRB 081007 with ATCA
  2. GRB 081007: Detection of a Supernova
  3. GRB 081007 and GRB 081007B: Fermi GBM detection
  4. GRB 081007: Radio Detection
  5. GRB 081007: Rapid PROMPT Detections
  6. GRB081007: Swift/UVOT Observations
  7. GRB 081007, SMARTS optical afterglow observations
  8. GRB 081007, Swift-BAT refined analysis
  9. GRB 081007: Early RAPTOR measurements of optical counterpart
  10. GRB 081007: Swift-XRT Team refined analysis
  11. GRB 081007: Gemini-south redshift
  12. GRB 081007: Enhanced Swift-XRT position
  13. GRB 081007, Faulkes Telescope North optical observations
  14. GRB 081007, SMARTS optical/IR afterglow observations
  15. GRB 081007: REM NIR and optical counterpart
  16. GRB 081007: Swift detection of a burst with optical afterglow

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