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').

15 results found.

  1. GRB 121212A: LOAO IzY Observation
  2. GRB 121212A: PdBI mm observations
  3. GRB121212A: NOT optical imaging
  4. GRB 121212A: Maidanak optical observations
  5. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  6. GRB 121212A: PAIRITEL NIR Observations
  7. GRB 121212A: Swift-XRT refined Analysis
  8. GRB 121212A: P60 Observations
  9. GRB 121212A: optical observations in ISON-NM observatory
  10. GRB 121212A: Keck observations
  11. GRB121212A: Swift/UVOT Detection
  12. GRB 121212A: Swift-BAT refined analysis
  13. GRB 121212A: Enhanced Swift-XRT position
  14. GRB 121212A: A long GRB detected by INTEGRAL
  15. GRB 121212A: 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