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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"

26 results found.

  1. GRB 251126A: SAO RAS optical marginal detection
  2. GRB 251126A: SVOM/VT optical observation
  3. GRB 251126A: SAO RAS optical observations
  4. GRB 251126A: Swift-BAT refined analysis
  5. GRB 251126A: TShAO, Mondy, and AbAO optical observations
  6. GRB 251126A: OHP/T193 optical observations and tentative spectroscopic redshift
  7. GRB 251126A: further SAO RAS optical observations
  8. GRB 251126A NUTTelA-TAO Early Measurements
  9. GRB251126A: MAO/AZT-22 optical observations
  10. GRB251126A: Continued optical observation from 1.3m DFOT
  11. GRB 251126A: Swift/UVOT Detection
  12. GRB 251126A: Mondy and SAO RAS optical observations
  13. GRB 251126A: Swift-XRT refined Analysis
  14. GRB 251126A : MITSuME Akeno optical afterglow candidate detection
  15. GRB 251126A: NOT optical observations
  16. GRB 251126A: 1.3m DFOT optical afterglow detection
  17. GRB 251126A: ULL-ASTRO-MASTER detection of the optical afterglow with LCO 1-m telescope at McDonald Observatory
  18. GRB 251126A: COLIBRÍ photometric redshift z = 3.5
  19. GRB 251126A: Enhanced Swift-XRT position
  20. GRB 251126A: Kilonova-Catcher optical afterglow detection
  21. GRB 251126A: Asiago i-band detection
  22. GRB 251126A: Nanshan/HMT optical afterglow detection
  23. Swift GRB 251126A: Global MASTER-Net observations report
  24. GRB 251126A: Prompt enhanced Swift-XRT position
  25. GRB 251126A: GIT discovery of the likely optical afterglow
  26. GRB 251126A: Swift detection of a burst

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Download all Circulars as a .tar.gz archive:
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