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').

8 results found.

  1. GRB 070529: SARA upper limit
  2. GRB 070529: MARGE Observations
  3. GRB 070529: Optical aterglow from MIRO
  4. GRB 070529: Gemini Redshift
  5. GRB 070529: Swift-XRT refined analysis
  6. GRB 070529, Swift-BAT refined analysis
  7. GRB 070529: Xinglong TNT Optical Upper Limit
  8. GRB 070529: Swift detection of a burst with an optical aterglow

Advanced

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