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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"

11 results found.

  1. Konus-Wind observation of GRB 190731A
  2. GRB 190731A: AstroSat CZTI detection
  3. GRB 190731A: Swift/UVOT Upper Limits
  4. GRB 190731A: no OT detected by MASTER
  5. GRB 190731A: Swift-XRT afterglow detection
  6. IPN Triangulation of GRB 190731A
  7. GRB 190731A: Fermi GBM detection
  8. GRB 190731A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 190731A: Swift ToO observations
  10. GRB190731A: Fermi-LAT detection
  11. GRB 190731A: Fermi GBM Final Real-time Localization

Advanced

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