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').

12 results found.

  1. GRB 190531B: CALET Gamma-Ray Burst Monitor detection
  2. GRB 190531B: Swift/UVOT Upper Limits
  3. Konus-Wind observation of GRB 190531B
  4. GRB 190531B: Insight-HXMT/HE detection
  5. GRB 190531B: VLT optical upper limit
  6. GRB 190531B: MASTER optical observation
  7. GRB 190531B: Swift-XRT afterglow detection
  8. GRB 190531B: Fermi GBM observations
  9. GRB 190531B: Swift ToO observations
  10. GRB 190531B: Fermi-LAT detection
  11. GRB 190531B: name correction re. GCN 24696
  12. GRB 190531B: 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