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').

10 results found.

  1. GRB 160624A: 15 GHz upper limits from AMI
  2. GRB 160624A: Swift/UVOT Upper Limits
  3. GRB 160624A: Lulin observation
  4. GRB 160624A: Swift-XRT refined Analysis
  5. GRB 160624A: MITSuME Ishigakijima upper limits
  6. GRB 160624A: Fermi GBM observation
  7. GRB 160624A, Swift-BAT refined analysis
  8. GRB 160624A: Enhanced Swift-XRT position
  9. GRB 160624A: Prompt enhanced Swift-XRT position
  10. GRB 160624A: Swift detection of a short burst


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