Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. 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 070802: REM optical observations
  2. GRB 070802: Swift-XRT refined analysis
  3. GRB 070802: Confirmation of the optical afterglow
  4. GRB 070802, Swift-BAT refined analysis
  5. GRB 070802: VLT redshift
  6. GRB 070802: refined Swift XRT position
  7. GRB 070802: V-band detection of the candidate afterglow
  8. GRB 070802: LCO I-band candidate
  9. GRB 070802: GROND J band candidate
  10. GRB 070802: LCO optical observations
  11. GRB 070802: Swift detection of a burst


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