Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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.

Advanced Search Examples (click to copy):

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

16 results found.

  1. GRB 100823A: optical upper limit
  2. GRB 100823A: optical observations
  3. GRB 100823A: MAXI/GSC detection
  4. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  5. GRB100823A : MOA optical observation
  6. GRB 100823A: Candidate IR afterglow
  7. GRB 100823A: Swift XRT refined analysis
  8. GRB 100823A: VLT/X-Shooter spectroscopy
  9. GRB 100823A - second epoch WHT observations
  10. GRB 100823A: TNG NIR observations
  11. GRB 100823: 1.5m OSN I-band observations
  12. GRB 100823A: Swift/UVOT Upper Limits
  13. GRB 100823A: WHT observations
  14. GRB 100823A: Swift-BAT refined analysis
  15. GRB 100823A: Enhanced Swift-XRT position
  16. GRB 100823A: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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