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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"

20 results found.

  1. GRB 251017A: Mondy AZT-33IK and Koshka Zeiss-1000 optical observations
  2. GRB 251017A: INASAN-Kislovodsk optical observations
  3. GRB 251017A : RAPAS follow-up observations
  4. GRB 251017A: COLIBRÍ optical observations of a late plateau
  5. GRB 251017A: Swift-BAT refined analysis
  6. GRB 251017A: Swift/UVOT Detection
  7. GRB 251017A: VLT/MUSE spectroscopic redshift z = 4.327
  8. GRB 251017A: COLIBRÍ photometric redshift
  9. GRB 251017A: Swift-XRT refined Analysis
  10. GRB 251017A: SVOM/VT optical observation
  11. GRB 251017A: OHP/T193 i-band observations
  12. GRB 251017A: J-band detection with WINTER
  13. GRB 251017A: Glowbug gamma-ray detection
  14. GRB 251017A: JinShan observations of the optical afterglow
  15. Swift GRB 251017A: Global MASTER-Net observations report
  16. GRB 251017A : MITSuME Akeno optical afterglow candidate detection
  17. GRB 251017A: Enhanced Swift-XRT position
  18. GRB 251017A: COLIBRÍ Early Afterglow Detection
  19. GRB 251017A: BOOTES-5/JGT early optical afterglow detection
  20. GRB 251017A: 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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