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').

14 results found.

  1. GRB 100802A: further NOT observation
  2. GRB 100802A: WIYN observations
  3. GRB 100802A: Fermi GBM observation
  4. GRB 100802A: NOT optical observation
  5. GRB100802A: MITSuME optical upper limits
  6. GRB 100802A: P60 Observations
  7. GRB 100802A: XRT refined analysis
  8. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  9. GRB 100802A: Enhanced Swift-XRT position
  10. GRB 100802A: Swift-BAT refined analysis
  11. GRB 100802A: Liverpool Telescope observations
  12. GRB 100802A: ROTSE-III Optical Limits
  13. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  14. GRB 100802A: 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