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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"

31 results found.

  1. GRB 070809: The Swift evidence for the SHB nature of this burst
  2. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  3. GRB 061201: Magellan Redshift of nearby Abell cluster
  4. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  5. Short GRB 060502B: Tautenburg Observation
  6. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  7. GRB 051227: Further analysis of the Swift-BAT burst
  8. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  9. GRB 051221: Correction to GCN #4368
  10. GRB 050911: z~0.16 cluster in the field
  11. GRB 050906: Swift-BAT refined analysis
  12. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  13. GRB 050813: Magellan detection of a high redshift galaxy cluster
  14. GRB 050724: Secure Host Redshift from Keck
  15. GRB 050724: WHT optical observations
  16. GRB 050724: Chandra Observations of the X-ray Afterglow
  17. GRB 050724, SMARTS optical/IR afterglow observations
  18. GRB 050724: dust-scattered X-ray halo detected in SWIFT/XRT observation
  19. GRB 050724: Optical Variability in Nearby Galaxy
  20. GRB 050724: J-band observations
  21. GRB 050724: GMOS Imaging and Spectroscopy
  22. GRB 050724: SWIFT XRT refined position
  23. GRB 050724: spectroscopy of object in the XRT error circle
  24. GRB 050724: Optical limit
  25. GRB 050724: optical and near-IR observations
  26. GRB 050724: Optical imaging/astrometry
  27. GRB 050724: RTT150 optical observations
  28. GRB 050724: Swift/UVOT Upper Limit
  29. GRB 050724: early Swift XRT analysis results
  30. GRB 050724 : Lulin early R-band monitoring observations
  31. GRB 050724: possible host galaxy in DSS

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Download all Circulars as a .tar.gz archive:
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