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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

43 results found.

  1. GRB 210619B: Maidanak and Assy optical observations, broken power law parametrization
  2. GRB 210619B: ALMA detection
  3. GRB 210619B: JCMT SCUBA-2 sub-mm observations
  4. GRB 210619B: Sayan observatory 1.6-m telescope observations
  5. GRB 210619B: Deep CAHA 2.2m detection and late-time light curve behavior
  6. GRB 210619B: ASIM observation
  7. GRB 210619B: Even further SAO RAS optical observations
  8. GRB 210619B: Mini-MegaTORTORA early optical observations
  9. GRB 210619B: Abbey Ridge Observatory optical afterglow observation
  10. GRB 210619B: SPI-ACS/INTEGRAL observations
  11. GRB 210619B: Further SAO RAS optical observations
  12. GRB 210619B: possibility of lensed visible afterglow?
  13. GRB 210619B: AbAO optical observations
  14. GRB 210619B: NOT optical observations
  15. GRB 210619B: 1.5m OSN optical observation
  16. GRB 210619B: iTelescope optical afterglow observation
  17. GRB 210619B: SAO RAS optical observations
  18. GRB 210619B: SEDM Optical Observations
  19. GRB 210619B: TNG NIR observations of the afterglow
  20. GRB 210619B: REM optical/NIR afterglow detection
  21. GRB 210619B: GIT optical follow-up and confirmation of jet-break
  22. GRB 210619B: CALET Gamma-Ray Burst Monitor detection
  23. GRB 210619B: SRG/ART-XC detection
  24. GRB 210619B: Swift-BAT refined analysis
  25. GRB 210619B: steepening of the decay observed at the D50
  26. GRB 210619B: Liverpool Telescope First Hour Observations
  27. GRB 210619B: Fermi GBM detection
  28. GRB 210619B: Swift/UVOT Detection
  29. GRB 210619B: Xinglong TNT optical observations
  30. Konus-Wind detection of GRB 210619B
  31. GRB 210619B: CAHA 2.2m photometric monitoring
  32. GRB 210619B: Liverpool Telescope r'-band observations
  33. GRB 210619B: KAIT Optical Detection
  34. GRB 210619B: Redshift from OSIRIS/GTC
  35. GRB 210619B: Liverpool telescope imaging of a red afterglow
  36. GRB 210619B: Fermi-LAT detection
  37. GRB 210619B: Swift-XRT refined Analysis
  38. GRB 210619B: SARA-KP 0.9m Optical Afterglow Detection
  39. GRB 210619B: Enhanced Swift-XRT position
  40. GRB 210619B: iTelescope T18 detection
  41. GECAM detection of GRB 210619B
  42. GRB 210619B: Ondrejov D50 detection
  43. GRB 210619B: Swift detection of a bright burst and optical counterpart

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