Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. 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').

17 results found.

  1. GRB 071011: MITSuME Optical Observations
  2. VLA non-detection of GRB 071011
  3. GRB 071011: Optical Limit after 13.95hrs
  4. GRB 071011: Xinglong TNT Optical afterglow observations
  5. GRB 071011: Swift-XRT refined analysis
  6. GRB 071011: NAYUTA Optical Observation, correction to GCN6886
  7. GRB 071011, Optical afterglow
  8. GRB 071011: Confirmation of P60 optical afterglow
  9. GRB 071011: Kanazawa Optical limits
  10. GRB 071011: P60 Optical Afterglow Candidate
  11. GRB 071011: MARGE Optical Limits
  12. GRB 071011: XRT afterglow detection
  13. GRB 071011, Swift-BAT refined analysis
  14. GRB 071011: Early Super-LOTIS Observations
  15. GRB 071011: NAYUTA Optical Observation
  16. GRB 071011: Optical afterglow candidate
  17. GRB 071011: Swift detection of a burst


Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit