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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 201017A iTelescope observation
  2. GRB 201017A: SAO RAS optical observations
  3. GRB 201017A: GROWTH-India optical upper limit
  4. GRB 201017A: MITSuME Akeno optical upper limits
  5. GRB 201017A: Swift-BAT refined analysis
  6. GRB 201017A: Assy and Mondy optical observations, possible afterglow detection
  7. GRB 201017A: Swift-XRT refined Analysis
  8. GRB 201017A: Fermi GBM detection
  9. GRB 201017A: Xinglong TNT upper limit
  10. GRB 201017A: Enhanced Swift-XRT position
  11. Swift GRB 201017A: Global MASTER-Net observations report
  12. GRB 201017A: Swift detection of a burst
  13. GRB 201017A: Fermi GBM Final Real-time Localization

Advanced

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