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').

7 results found.

  1. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  2. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  3. GRB 070913: Swift-BAT refined analysis
  4. GRB 070913: Corrected BAT position
  5. GRB 070913: SMARTS optical/IR observations
  6. GRB 070913: TAROT La Silla observatory optical observations
  7. GRB 070913: 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