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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"

13 results found.

  1. GRB 251118A: TERI Gamma-ray detection
  2. Konus-Wind detection of GRB 251118A
  3. GRB 251118A: Swift/UVOT Detection
  4. GRB 251118A: Glowbug gamma-ray detection
  5. GRB 251118A: Fermi GBM Observation
  6. GRB 251118A: Swift-XRT afterglow detection
  7. GRB 251118A: GECAM-B detection
  8. GRB 251118A: NuSTAR detection of bright prompt emission
  9. GRB 251118C: Swift/BAT rates detection of a burst with a possible association with EP 251118A
  10. GRB 251118A: Fermi-LAT detection
  11. GRB 251118A: Swift ToO observations
  12. GRB 251118A: BALROG localization (Fermi Trigger 785190695 / GRB 251118855)
  13. GRB 251118A: Fermi GBM Final Real-time Localization

Advanced

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