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').

9 results found.

  1. GRB 170113A: VLT/X-shooter redshift
  2. GRB 170113A: GROND afterglow observations
  3. GRB 170113A: Swift-BAT refined analysis
  4. GRB 170113A: Swift/UVOT Observations
  5. GRB 170113A: Swift-XRT refined Analysis
  6. GRB 170113A: Fermi GBM observations
  7. GRB 170113A: Enhanced Swift-XRT position
  8. GRB 170113A: LCO Sutherland observations
  9. GRB 170113A: Swift detection of a burst with an optical counterpart

Advanced

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