Skip to main content
Circulars over Kafka event name backfill. 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').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

24 results found.

  1. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  2. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  3. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  4. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  5. GRB 100805A: optical observation in CrAO
  6. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  7. GRB 100805A: SAO RAS optical observations
  8. GRB 100805A: IAC80 and 1.5m OSN optical observations
  9. GRB 100805A: Xinglong TNT optical observation
  10. GRB 100805A: Early RAPTOR Observations
  11. GRB 100805A: ROTSE-III Optical detection
  12. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  13. GRB 100805A: IAC80 BVR-band observations
  14. GRB 100805A: Swift-BAT refined analysis
  15. GRB 100805A: Swift-XRT Refined Analysis
  16. GRB 100805A: GRAS 002 optical observations
  17. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  18. GRB 100805A: Enhanced Swift-XRT position
  19. GRB 100805A: Liverpool Telescope afterglow observations
  20. GRB 100805A: Further P60 Monitoring
  21. GRB 100805A: P60 Optical Afterglow Candidate
  22. GRB 100805A: Enhanced Swift-XRT position
  23. GRB 100805A: ROTSE-III Optical Limits
  24. GRB 100805A: Swift detection of a burst with an optical counterpart

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov