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').

22 results found.

  1. GRB 100901A: TLS Observations: Break?
  2. GRB 071003: Keck spectroscopy
  3. GRB 070311, deep optical photometry
  4. GRB 070311, deep optical photometry
  5. GRB 070311: Late Central Engine Activity Optical Flare??
  6. GRB 070311: MDM Optical Monitoring
  7. VLA observation of GRB 070311
  8. GRB 070311: Tautenburg sees afterglow fading
  9. GRB 070311: Optical observation.
  10. GRB 070311: Optical Brightening
  11. GRB 070311: SARA upper limit
  12. GRB 070311: MDM Optical Follow-up
  13. GRB 070311: RAPTOR Detection of Optical Emission
  14. GRB070311: FRAM early follow-up limit
  15. GRB 070311: P60 Observations
  16. GRB 070311: MDM Optical Detection
  17. GRB 070311: Swift/UVOT Upper Limits
  18. GRB 070311: MITSuME Okayama Optical Observation
  19. GRB 070311: Swift-XRT refined analysis
  20. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  21. GRB 070311: REM candidate afterglow
  22. GRB 070311: a long GRB detected by INTEGRAL

Advanced

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