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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 160821B: HST detection of the optical and IR counterpart
  2. GRB 160303A: Continued optical monitoring from NOT
  3. GRB 150101B/Swift J123205.1-105602: VLT observations and redshift
  4. GRB 130603B: Second epoch of HST WFC/F160W imaging
  5. GRB 130603B: First epoch of XMM-Newton observations
  6. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  7. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  8. GRB 130603B: HST limits on an underlying supernova
  9. GMRT radio observation of GRB 130603B
  10. GRB 130603B: rest-frame energetics in gamma-rays
  11. Konus-Wind observation of GRB 130603B
  12. GRB 130603B: MASTER-Net early observations and optical sloap limit
  13. GRB 130603B: AMI-LA 15GHz observations
  14. GRB 130603B: RATIR Optical and NIR Observations
  15. GRB 130603B: P60 Observations
  16. GRB130603B: Swift/UVOT detection
  17. GRB 130603B: VLT/X-shooter redshift confirmation
  18. GRB 130603B: 5.8 GHz VLA detection
  19. GRB 130603B: Swift-XRT refined Analysis
  20. GRB 130603B: Gemini Observations
  21. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  22. GRB 130603B: Swift-BAT Spectral lag analysis
  23. GRB 130603B: Magellan redshift confirmation
  24. GRB 130603B: Short GRB afterglow spectrum from GTC
  25. GRB 130603B: Afterglow detection from NOT
  26. GRB 130603B: WHT optical afterglow candidate
  27. GRB 130603B: Swift-BAT refined analysis
  28. GRB 130603B: Enhanced Swift-XRT position
  29. GRB 130603B: Swift detection of a bright short burst

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