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').

7 results found.

  1. GRB 181022A: Swift-XRT refined Analysis
  2. GRB 181022A: MITSuME Akeno optical upper limits
  3. GRB 181022A: GROND upper limits
  4. GRB 181022A: LCO Sutherland observations
  5. GRB 181022A: Swift/UVOT Upper Limits
  6. GRB 181022A: Swift-BAT refined analysis
  7. GRB 181022A: 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