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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"

12 results found.

  1. VLA radio upper limit on GRB 080721
  2. GRB 080721 : Lulin 2nd optical follow-ups
  3. GRB 080721: OA fading and redshift
  4. GRB 080721: UVOT Follow-Up Observations
  5. Konus-Wind observation of GRB 080721
  6. GRB 080721: Swift-XRT refined analysis
  7. GRB 080721: Enhanced Swift-XRT position
  8. GRB 080721, Swift-BAT refined analysis
  9. GRB 080721: Swift/UVOT Photometric Redshift
  10. GRB 080721 : Lulin Optical follow-ups
  11. GRB 080721: Swift-XRT correct position
  12. GRB 080721: Swift detection of a burst with a bright 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

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