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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"

21 results found.

  1. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  2. GRB 110709B / EVLA detection of radio counterpart
  3. GRB 110709B : Suzaku WAM observation of the prompt emission
  4. GRB 110709B: Swift/UVOT Observations
  5. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  6. GRB 110709B: Submm observations from APEX
  7. GRB 110709B BAT refined analysis
  8. GRB 110709B: burst detection from Swift-BAT slew data
  9. GRB 110709B: Swift-XRT refined Analysis
  10. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  11. GRB 110709B: correction to GCN 12135 (Konus-Wind peak flux)
  12. GRB 110709B: Enhanced Swift-XRT position
  13. Konus-Wind observation of GRB 110709B
  14. GRB 110709B: Gemini-South additional analysis and photometry
  15. GRB 110709B : A possible source in USNO B 1.0
  16. GRB 110709B: Preliminary Swift-BAT refined analysis
  17. GRB 110709B: GROND Detection of an Afterglow Candidate
  18. GRB 110709B: Gemini-South optical observations
  19. GRB 110709B: possible quiescent source in DSS
  20. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  21. GRB 110709B: Swift detection of a burst

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