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').

19 results found.

  1. GRB 141121A: AAO optical observations
  2. GRB 141109A: further VLA observations
  3. GRB 141109A: VLA detection
  4. GRB 141109A: TAROT La Silla observatory optical observations
  5. GRB 141109A: AAO optical observations
  6. GRB 141109A: Terskol photometry
  7. GRB 141109A: Swift/UVOT Detection
  8. GRB 141109A: NOT r-band observation
  9. Konus-Wind observation of GRB 141109A
  10. GRB141109A : Xinglong TNT optical observation
  11. GRB 141109A: MITSuME Ishigakijima upper limits
  12. GRB 141109A: Swift-XRT refined Analysis
  13. GRB 141109A: Swift-BAT refined analysis
  14. GRB 141109A: Enhanced Swift-XRT position
  15. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  16. GRB 141109A: GROND afterglow observation
  17. X-shooter redshift of GRB 141109A
  18. GRB 141109A: REM NIR candidate afterglow
  19. GRB 141109A: 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