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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

29 results found.

  1. GRB 210619B: Maidanak and Assy optical observations, broken power law parametrization
  2. GRB 210619B: ALMA detection
  3. GRB 210619B: Sayan observatory 1.6-m telescope observations
  4. GRB 210619B: Deep CAHA 2.2m detection and late-time light curve behavior
  5. GRB 210619B: ASIM observation
  6. GRB 210619B: Abbey Ridge Observatory optical afterglow observation
  7. GRB 210619B: SPI-ACS/INTEGRAL observations
  8. GRB 210619B: Further SAO RAS optical observations
  9. GRB 210619B: possibility of lensed visible afterglow?
  10. GRB 210619B: iTelescope optical afterglow observation
  11. GRB 210619B: SAO RAS optical observations
  12. GRB 210619B: SEDM Optical Observations
  13. GRB 210619B: TNG NIR observations of the afterglow
  14. GRB 210619B: CALET Gamma-Ray Burst Monitor detection
  15. GRB 210619B: SRG/ART-XC detection
  16. GRB 210619B: steepening of the decay observed at the D50
  17. GRB 210619B: Liverpool Telescope First Hour Observations
  18. GRB 210619B: Xinglong TNT optical observations
  19. Konus-Wind detection of GRB 210619B
  20. GRB 210619B: Liverpool Telescope r'-band observations
  21. GRB 210619B: KAIT Optical Detection
  22. GRB 210619B: Fermi-LAT detection
  23. GRB 210619B: Swift-XRT refined Analysis
  24. GRB 210619B: SARA-KP 0.9m Optical Afterglow Detection
  25. GRB 210619B: Enhanced Swift-XRT position
  26. GRB 210619B: iTelescope T18 detection
  27. GECAM detection of GRB 210619B
  28. GRB 210619B: Ondrejov D50 detection
  29. GRB 210619B: Swift detection of a bright burst and optical counterpart

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