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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"

28 results found.

  1. GRB 130518B found in ground analysis of Swift-BAT data
  2. GRB 130418A: TNG NIR observations
  3. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  4. GRB 130418A: Continued RATIR Optical and NIR Observations
  5. GRB 130418A: WSRT radio observation
  6. GRB 130420A: ISON-NM optical observations
  7. Konus-Wind observation of GRB 130418A
  8. GRB 130418A: Continued RATIR Optical and NIR Observations
  9. GRB 130418A: Swift-XRT refined Analysis
  10. GRB 130418A: SMARTS optical/IR afterglow observations
  11. GRB 130418A: Submm observations from SMA
  12. GRB 130418A: T21 optical observation
  13. GRB 130418A: T18 and T21 optical observations
  14. GRB 130418A: LOAO Observation
  15. GRB 130418A, Swift-BAT refined analysis
  16. GRB130418A: VLT/X-shooter redshift confirmation
  17. GRB 130418A: REM NIR observations
  18. GRB 130418A: RATIR Optical and NIR Observations
  19. GRB 130418A: CARMA 3mm detection
  20. GRB 130418A: GROND detection of the optical-NIR afterglow
  21. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  22. GRB 130418A: Enhanced Swift-XRT position
  23. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  24. GRB 130418A: TNG optical observations
  25. GRB 130418A: Redshift from 10.4m GTC
  26. GRB 130418A: Bassano Bresciano Observatory optical observations
  27. GRB 130418A: 1.23m I-band observations
  28. GRB 130418A: Swift detection of a burst with an optical counterpart

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Download all Circulars as a .tar.gz archive:
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