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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"

635 results found.

  1. GRB050801: Swift-BAT detection of a burst
  2. GRB 050509b: Swift XRT Position
  3. IPN Summary of SGR1806-20 Activity in 2004
  4. IPN triangulation of GRB030413 (small error box)
  5. IPN triangulation of GRB021211B (two large error boxes)
  6. IPN triangulation of GRB020904
  7. IPN triangulation of GRB020715 (=GRB150702)
  8. IPN triangulation of GRB150702
  9. GRB020124 optical observations with RIBOTS/RIMOTS
  10. XRF/GRB 011030: Detection of the Probable Host Galaxy
  11. GRB 011030: TNG K-band observation
  12. XRF011030: J and K band observations
  13. XRF011030: Chandra Observations
  14. GRB 011030: K-band observations
  15. The X-ray Flash 011030 ('GRB 011030')
  16. GRB 011030, WSRT radio observations
  17. GRB011030 - further refinement WFC position
  18. GRB 011030, Radio observations
  19. GRB010220, Radio and Optical Observations
  20. GRB010213 (HETE) TAROT observations
  21. GRB 001109: deep JHK upper limits
  22. GRB 000301A, Radio Observations
  23. BEPPOSAX GRBM Localization of GRB991226
  24. IPN localization of GRB991226
  25. Optical Observations of GRB990627
  26. BeppoSAX NFI Observation of GRB980425
  27. GRB980425 Optical Follow-up
  28. GRB980425: X-ray revised positions
  29. GRB970519, optical follow-up at Schmidt Calern
  30. BSAX Observations of GRB980425 field
  31. GRB980425 BATSE observations
  32. GRB 980425 optical observations
  33. GRB980425: optical obs.
  34. GRB980425: Radio Observations
  35. GRB 980425 optical observations

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Download all Circulars as a .tar.gz archive:
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