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').

14 results found.

  1. GRB 100901A: TLS Observations: Break?
  2. GRB 060906: optical observation
  3. GRB 060906: Early RAPTOR optical limits
  4. GRB 060906, Swift-BAT refined spectral analysis
  5. GRB 060906: Swift/XRT Refined Analysis
  6. GRB 060906: Swift-UVOT observations
  7. VLT redshift of GRB 060906
  8. GRB 060906, Swift-BAT refined analysis
  9. GRB 060906: FRAM observations - flash determination (airplane)
  10. GRB 060906: KAIT observations
  11. GRB 060906: Confirmation of P60 Optical Afterglow
  12. GRB 060906: observations with FRAM
  13. GRB 060906 (?): P60 Optical Afterglow Candidate
  14. GRB 060906: Swift detection of a probable burst

Advanced

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