Skip to main content
New Swift-BAT/GUANO and IceCube Notice Types Available! 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').

12 results found.

  1. GRB 220511A: Swift-XRT afterglow detection
  2. Konus-Wind detection of GRB 220511A
  3. GRB 220511A: Fermi GBM observation
  4. GRB 220511A: Swift-XRT observations
  5. GRB 220511A: AstroSat CZTI detection
  6. GRB 220511A: BOOTES-2/TELMA optical upper limit
  7. GRB 220511A: Swift ToO observations
  8. GRB 220511A: Swift/BAT-GUANO arcminute localization
  9. Fermi GRB 220511A: Global MASTER-Net observations report
  10. GRB 220511A: AGILE detection
  11. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)
  12. GRB 220511A: Fermi GBM Final Real-time Localization

Advanced

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