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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 190627A: Discovery Channel Telescope late time observations
  2. GRB 190106A: Discovery Channel Telescope observations
  3. GRB 190106A: GMG continued observation
  4. GRB 190106A: OSN Afterglow Observations
  5. GRB 190106A: optical observations, possible jet break detection
  6. GRB 190106A: Liverpool Telescope observations
  7. GRB 190106A: Mondy optical observations
  8. GRB 190106A : continued TSHAO optical observations
  9. Konus-Wind observation of GRB 190106A
  10. GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
  11. IERCOO/ICSP optical observation of GRB 190106A
  12. GRB 190106A: GMG photometry in the 2nd night
  13. GRB 190106A: Swift-XRT refined Analysis
  14. GRB 190106A: VLT/X-shooter redshift confirmation
  15. GRB 190106A: GMG spectral results
  16. GRB 190106A: update of the Xinglong-2.16m spectroscopy
  17. GRB 190106A: OASDG optical observations
  18. GRB 190106A: BOOTES-4/MET optical observations
  19. GRB 190106A: Swift/UVOT Detection
  20. GRB 190106A: Swift-BAT refined analysis
  21. GRB 190106A: Bassano Bresciano Observatory optical detection
  22. GRB 190106A: Xinglong-2.16m spectroscopy
  23. GRB 190106A: GWAC-F60B optical detection
  24. GRB 190106A : TSHAO optical observations
  25. GRB 190106A: Enhanced Swift-XRT position
  26. GRB 190106A: GMG detection
  27. GRB 190106A: MITSuME Akeno optical observation
  28. GRB 190106A: MASTER Amur OT detection
  29. GRB 190106A: Swift detection of a burst with an optical counterpart

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