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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"

6 results found.

  1. Konus-Wind detection of GRB 250308A
  2. GRB 250308A: Swift/BAT-GUANO localization skymap of a short burst
  3. GRB 250308A: CALET Gamma-Ray Burst Monitor detection
  4. IPN triangulation of GRB 250308A (short)
  5. GRB 250308A: SVOM/GRM detection of QPO in the tail emission
  6. GRB 250308A: SVOM/GRM observation of a bright short burst

Advanced

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