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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 201021C: TAROT Reunion observatory optical light curve
  2. GRB 201021C: Swift-BAT refined analysis
  3. GRB 201021C: Swift-XRT refined Analysis
  4. GRB 201021C: Fermi GBM detection
  5. GRB 201021C: Swift/UVOT Detection
  6. GRB 201021C: VLT/X-shooter redshift
  7. GRB 201021C: Enhanced Swift-XRT position
  8. GRB 201021C: MASTER optical synchronously observation
  9. GRB 201021C: Swift detection of a burst with an optical counterpart

Advanced

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