Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

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. 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"

30 results found.

  1. GRID detection of GRB 260511A
  2. GRID detection of GRB 260507A
  3. GRID detection of GRB 260401A
  4. GRID detection of GRB 260326A
  5. GRID detection of GRB 260320A
  6. GRID detection of GRB 260312B
  7. GRB 260131A/B: radio detection with the VLA
  8. GRID detection of GRB 260225D
  9. GRID detection of GRB 260223A
  10. GRID detection of GRB 260207B
  11. GRID detection of GRB 260131A/B
  12. GRB 251213A: GRID-10B observation
  13. GRID detection of GRB 251213A
  14. GRID detection of GRB 250824A
  15. GRID detection of GRB 250612C
  16. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  17. GRID detection of GRB 240306A
  18. GRID detection of GRB 240229A (Updated Report)
  19. GRID detection of GRB 240229A
  20. GRID detection of GRB 231230A
  21. GRID detection of GRB 231215A
  22. GRID detection of GRB 231205B
  23. GRID detection of GRB 231205A
  24. GRID detection of GRB 231020A
  25. GRID detection of GRB 231004A
  26. GRID detection of GRB 230827A
  27. GRID detection of GRB 230818A
  28. GRB 230703A detected with multiple GRID detectors
  29. GRB 230628C: GRID Detection
  30. GRB 230625A: Detection by GRID

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