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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"

26 results found.

  1. Konus-Wind detection of GRB 261007A/EP261007a
  2. GRB 261007A: SVOM/ECLAIRs refined analysis
  3. GRB 261007A / EP261007a: SVOM/GWAC-F60A/B observations
  4. GRB 261007A: Glowbug gamma-ray detection
  5. GRB 261007A: NOT optical observations
  6. GRB 261007A: SVOM/GRM observation
  7. GRB 261007A / EP261007a: AstroSat CZTI detection
  8. EP261007a/GRB 261007A：Xinglong optical observation
  9. GRB 261007A/EP261007a: Optical follow-up observations with Kinder
  10. GRB 261007A / EP261007a: SVOM/VT optical observations
  11. GRB 261007A: Swift-XRT afterglow detection
  12. GRB 261007A: SVOM/COLIBRÍ (FM-GFT) optical observations
  13. GRB 261007A / EP261007a: NuSTAR detection of prompt emission
  14. GRB 261007A / EP261007a: ULL-ASTRO-MASTER detection of the optical afterglow with LCO 40-cm telescope at McDonald Observatory
  15. GRB 261007A: Autonomous identification and follow-up of the counterpart to GRB 261007A by BTSbot with ZTF and P60/SEDM
  16. GRB 261007A: GROWTH-India Telescope optical observations
  17. GRB 261007A / EP261007a: TRT optical observations
  18. GRB 261007A: Swift ToO observations
  19. GRB 261007A: SVOM/C-GFT optical observations
  20. GRB 261007A / EP261007a: LCO optical observations
  21. GRB 261007A: WINTER J-band observations
  22. GRB 261007A: Fermi GBM observation
  23. GRB 261007A / EP261007a: VLT/X-shooter spectroscopic redshift z = 2.101
  24. EP261007a/GRB 261007A: Einstein Probe detection of an X-ray transient
  25. GRB 261007A: KAIT optical counterpart candidate
  26. GRB 261007A: SVOM detection of a burst

Advanced

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