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').

11 results found.

  1. GRB 231018A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  2. GRB 231018A: VZLUSAT-2 detection
  3. GRB 231018A: GRBAlpha detection
  4. GRB 231018A: CALET Gamma-Ray Burst Monitor detection
  5. GRB 231018A: Glowbug gamma-ray detection
  6. Konus-Wind detection of GRB 231018A
  7. IPN triangulation of GRB 231018A
  8. GRB 231018A: GROWTH-India Follow-Up of a Fermi Long GRB
  9. GRB 231018A: Fermi GBM Detection
  10. GRB 231018A: BALROG localization (Fermi Trigger / GRB 231018521)
  11. GRB 231018A: 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