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').

10 results found.

  1. GRB 190219A: CrAO and AbAO optical upper limit
  2. GRB 190219A: Swift-BAT refined analysis
  3. GRB 190219A: NOT optical afterglow candidate
  4. GRB 190219A: NEXT-0.6m optical upper limit
  5. GRB 190219A: Swift-XRT refined Analysis
  6. GRB 190219A: Enhanced Swift-XRT position
  7. GRB 190219A: CAHA 2.2m observations
  8. GRB 190219A: BOOTES-1 optical limits
  9. GRB 190219A: Prompt enhanced Swift-XRT position
  10. GRB 190219A: Swift detection of a burst


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