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"

27032 results found.

  1. Search for Potential Images of GRB 990123
  2. Search for Potential Images of GRB 990123
  3. GRB990123, OSSE observations
  4. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  5. GRB 990123: BATSE Observations
  6. GRB990123, early optical counterpart detection
  7. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  8. GRB990123, BeppoSAX WFC detection and NFI planned follow-up
  9. Possible identification of SN1999E with GRB980910
  10. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  11. GRB 980923 BATSE Observations
  12. SGR1900+14, BeppoSAX-GRBM observations
  13. GRB980703 - BeppoSAX/GRBM detection
  14. GRB 980703: BATSE Observations
  15. RXTE Observation of GRB 980706
  16. GRB980703: LOTIS observation at early times
  17. GRB 980703: ASM Position & Intensity
  18. GRB 980613: BATSE Observations
  19. SGR1627-41, BeppoSAX-GRBM detections
  20. Discovery of a new SGR source, SGR1627-41
  21. BATSE on-board GRB trigger change
  22. GRB980519 BATSE Observations
  23. BATSE on-board GRB trigger change
  24. GRB980519, BeppoSAX-WFC updated position
  25. GRB980519, BeppoSAX-WFC position
  26. GRB980425 BATSE observations
  27. report on BSAX observations of GRB980425
  28. GRB980326 IPN annulus
  29. GRB980329 IPN annulus
  30. GRB 971024: Refined analysis by USNOFS Observations
  31. GRB 971024: USNO Observations
  32. GRB 970925: BATSE 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