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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 260208A: radio detection with the VLA
  2. GRB 260208A: TERI Gamma-ray detection
  3. GRB 260208A: AbAO and Terskol optical upper limits
  4. GRB 260208A: continued Mondy optical observations
  5. GRB 260208A: Swift UVOT detection
  6. GRB 260208A: LCO detection of the optical counterpart
  7. GRB 260208A: Glowbug gamma-ray detection
  8. GRB 260208A: NuSTAR detection of prompt emission
  9. GRB 260208A: Fermi GBM Observation
  10. GRB 260208A: Mondy optical observations (duplicate submission)
  11. GRB 260208A: Mondy optical observations
  12. GRB 260208A: 1.3m DFOT optical detection
  13. GRB 260208A: COLIBRÍ optical observations
  14. GRB 260208A: NOT spectroscopic redshift z = 2.36
  15. GRB 260208A: Liverpool Telescope optical detection
  16. GRB 260208A: GECAM-B observation of a bright burst
  17. GRB 260208A: Zwicky Transient Facility Follow-Up of a Fermi GRB (Trigger 792220053)
  18. GRB 260208A: SVOM/VT optical observation
  19. GRB 260208A: Swift-XRT observations
  20. GRB 260208A: Fermi-LAT detection
  21. GRB 260208A: Swift ToO observations
  22. GRB 260208A: Fermi GBM Classification Correction
  23. GRB 260208A: GOTO detection of a potential optical counterpart (GOTO26aob)
  24. GRB 260208A : MASTER bright optical transient inside retracted Fermi error-box
  25. Fermi GRB 260208A: Global MASTER-Net observations report
  26. GRB 260208A: Fermi GBM Final Real-time Localization

Advanced

Download all Circulars as a .tar.gz archive:
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