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"

15 results found.

  1. GRB 090530: X-shooter redshift
  2. GRB 090530: Further NOT optical observations
  3. GRB 090530: RTT150 Optical Observation
  4. GRB 090530: Early RAPTOR Optical Observations
  5. GRB 090530: GRT Optical Observation
  6. GRB 090530: break in light curve
  7. GRB 090530: NOT optical observations
  8. GRB090530: Swift XRT refined analysis
  9. GRB090530: Swift/UVOT afterglow detection
  10. GRB 090530: Enhanced Swift-XRT position
  11. GRB 090530: Swift-BAT refined analysis
  12. GRB 090530: GRAS002 refined OA analysis
  13. GRB 090530: GRAS002 optical observations
  14. GRB 090530: PAIRITEL NIR Detections
  15. GRB 090530: Swift detection of a burst with an optical counterpart

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