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').

14 results found.

  1. GRB 090813: I-band observations from 1.5m OSN telescope
  2. GRB 090813: Suzaku WAM observation of the prompt emission
  3. GRB 090813: CrAO optical obsevations
  4. GRB 090813: correction to GCN 9787
  5. GRB 090813: Fermi GBM observation
  6. GRB 090813: Swift-XRT refined analysis
  7. GRB 090813, Swift-BAT refined analysis
  8. Konus-Wind observations of GRB090813
  9. GRB090813: Swift/UVOT upper limits
  10. GRB 090813: Enhanced Swift-XRT position
  11. GRB 090813: Liverpool Telescope afterglow confirmation
  12. GRB 090813: P60 Optical Afterglow Confirmation
  13. GRB 090813: optical candidate from 1.23m CAHA telescope
  14. GRB 090813: 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