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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"

30 results found.

  1. GRB 261011A: 1.3m DFOT optical upper limit
  2. GRB 261011A: SAO RAS and AbAO optical observations
  3. GRB 261011A: Later-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  4. GRB 261011A: GECAM-B observation
  5. GRB 261011A: Swift-XRT refined Analysis
  6. GRB 261011A: Enhanced Swift-XRT position
  7. GRB 261011A: 10.4m GTC spectroscopic redshift (z = 2.407)
  8. GRB 261011A: Swift-BAT refined analysis
  9. GRB 261011A: REM optical/NIR observations
  10. Konus-Wind detection of GRB 261011A
  11. GRB 261011A: SOAR optical afterglow observations at ~17 hours
  12. GRB 261011A: VLT/X-shooter redshift constraints
  13. GRB 261011A : MITSuME Akeno optical afterglow candidate detection
  14. GRB 261011A: Optical followup from Sichuan South Observatory
  15. GRB 261011A: GMG Optical Observation
  16. GRB 261011A: Liverpool Telescope optical observations
  17. GRB 261011A: J-band observations by the SYSU 80cm infrared telescope
  18. GRB 261011A: continued LCO optical observations
  19. GRB 261011A: GROWTH-India Telescope optical observations
  20. GRB 261011A: Luminance-band upper limit from a 28cm telescope in Chengde
  21. Swift GRB 261011A: Global MASTER-Net observations report
  22. GRB 261011A: Optical follow-up observations with Kinder
  23. GRB 261011A: SVOM/C-GFT optical observations
  24. GRB 261011A: LCO optical observations
  25. GRB 261011A: SVOM/VT optical observation from VHF data
  26. GRB 261011A: LCO optical observations
  27. GRB 261011A: TRT optical afterglow detection
  28. GRB 261011A: GOTO optical counterpart detection
  29. GRB 261011A: Swift detection of an unusual burst
  30. GRB 261011A: SVOM detection of a long bright burst

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