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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"

9 results found.

  1. GRB 250114B: Swift-XRT afterglow detection
  2. GRB 250114B: SVOM/VT upper limit
  3. GRB 250114B: Liverpool Telescope optical upper limit
  4. GRB 250114B : MITSuME Akeno optical afterglow candidate detection
  5. GRB 250114B: Swift-XRT observations
  6. GRB 250114B: OHP/T193 optical upper limit
  7. GRB 250114B : GIT optical upper limit
  8. GRB 250114B: Swift ToO observations
  9. GRB 250114B: a short GRB detected with INTEGRAL

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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