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').

13 results found.

  1. GRB 100205A: Keck limits on an underlying host galaxy
  2. GRB 100205A: BOAO/LOAO zYJK observation
  3. GRB 100205A: GROND upper limits
  4. GRB 100205A: Gemini-N + NIRI photometry
  5. GRB 100205A: Swift-BAT refined analysis
  6. GRB 100205A: Swift UVOT upper limits
  7. GRB 100205A: Swift XRT refined analysis
  8. GRB 100205A: Enhanced Swift-XRT position
  9. GRB 100205A Gemini-North IR afterglow candidate
  10. GRB 100205A: Gemini-South Observations
  11. GRB 100205A: Super-LOTIS early observations
  12. GRB 100205A: NOT optical observations
  13. GRB 100205A: Swift detection of a burst

Advanced

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