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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"

25 results found.

  1. GRB 230328B: LBT detection of the likely host galaxy
  2. GRB 230328B: redshift lower limit estimating
  3. GRB 230328B: Multa observatory optical afterglow observation
  4. GRB 230328B: Swift/UVOT Detection
  5. GRB 230328B : GRANDMA/Kilonova-Catcher optical detection
  6. GRB 230328B: CAHA 2.2m/CAFOS detection
  7. GRB 230328B: 3.6m DOT multiband optical observation
  8. Konus-Wind detection of GRB 230328B
  9. GRB 230328B: GRBAlpha detection
  10. GRB 230328B: Swift-BAT refined analysis
  11. GRB 230328B: Nanshan/NEXT 2nd optical observation
  12. GRB 230328B NUTTelA-TAO / BSTI Early Measurements
  13. GRB 230328B: Liverpool Telescope afterglow detection
  14. GRB 230328B: OHP/T120 optical observations
  15. GRB 230328B: GIT optical follow-up
  16. GRB 230328B: OASDG optical observations
  17. GRB 230328B: Nanshan/NEXT optical upper limit
  18. GRB 230328B: Swift-XRT refined Analysis
  19. GRB 230328B: AstroSat CZTI detection
  20. GRB 230328B: Fermi GBM observation
  21. GRB 230328B: Mondy, AbAO and Kitab optical observations
  22. GRB 230328B: Enhanced Swift-XRT position
  23. GRB 230328B: Mondy optical afterglow confirmation
  24. GRB 230328B: Swift detection of a burst with an optical afterglow
  25. GRB 230328B: Fermi GBM Final Real-time Localization

Advanced

Download all Circulars as a .tar.gz archive:
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