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"

13 results found.

  1. GRB 241209D: GRBAlpha detection
  2. GRB 241209D: CALET Gamma-Ray Burst Monitor detection
  3. GRB 241209D: REM optical/NIR upper limits
  4. Konus-Wind detection of GRB 241209D
  5. GRB 241209D: AstroSat CZTI detection
  6. GRB 241209D: Swift-XRT refined Analysis
  7. GRB 241209D: Fermi GBM Observation
  8. GRB 241209D: COLIBRÍ detection of the afterglow
  9. Fermi GRB 241209D: Global MASTER-Net observations report
  10. Swift GRB 241209D: Global MASTER-Net observations report
  11. GRB 241209D: Enhanced Swift-XRT position
  12. GRB 241209D: Swift detection of a burst
  13. GRB 241209D: Fermi GBM Final Real-time Localization

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