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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"

26 results found.

  1. GRB 170202A: 15 GHz upper limits from AMI
  2. GRB 170202A: SMARTS optical/IR afterglow observations
  3. Konus-Wind observation of GRB 170202A
  4. GRB 170202A: SQUEAN Observation (2nd night)
  5. GRB 170202A: Zadko observatory - Gingin optical observations
  6. GRB 170202A: Etelman Observatory optical observations
  7. GRB 170202A: Swift-BAT refined analysis
  8. GRB 170202A: RATIR Optical and NIR Observations
  9. GRB 170202A: SQUEAN Observation
  10. GRB 170202A: LCO FTN observations
  11. GRB 170202A: Swift-XRT refined Analysis
  12. GRB 170202A: T100 observations
  13. GRB 170202A VLT/X-shooter redshift [minor correction]
  14. GRB 170202A: Xinglong 2.16m photometry and spectroscopic redshift
  15. GRB 170202A: Swift/UVOT Detection
  16. GRB 170202A: Enhanced Swift-XRT position
  17. GRB 170202A: MITSuME Akeno Optical Observation
  18. GRB 170202A: Redshift from OSIRIS/GTC
  19. GRB 170202A: NOT afterglow observations
  20. GRB 170202A: Kanata optical and infrared observations
  21. GRB 170202A: Zadko observatory - Gingin optical observations
  22. GRB 170202A: LCO Sutherland observations
  23. GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
  24. GRB 170202A: Mini-MegaTORTORA upper limits
  25. GRB 170202A : Xinglong TNT optical observation
  26. GRB 170202A: Swift detection of a burst with an optical afterglow

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Download all Circulars as a .tar.gz archive:
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