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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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

18 results found.

  1. IceCube 200117A: No significant detection in HAWC
  2. IceCube-200109A: Candidate Counterparts from the Zwicky Transient Facility
  3. Fermi-LAT Gamma-ray Observations of IceCube-200109A and detection of a possible new gamma-ray source, Fermi J1055.8+1034
  4. GRB 200109A: Insight-HXMT/HE detection
  5. IceCube 200109A: No significant detection in HAWC
  6. IceCube-200109A: Upper limits from a search for additional neutrino events in IceCube
  7. IceCube-200109A: Swift-XRT and UVoT Follow-up Observations
  8. ANTARES 200108A: No detection by Swift-XRT
  9. IceCube-200109A: INTEGRAL was inactive at the time of the event
  10. IceCube-200109A: Upper limits from Fermi-GBM Observations
  11. IceCube-200109A: IceCube observation of a high-energy neutrino candidate event
  12. GRB 200109A: Swift-BAT refined analysis
  13. GRB 200109A: Swift/UVOT Upper Limits
  14. GRB 200109A: Fermi GBM observation
  15. GRB 200109A: Swift-XRT refined Analysis
  16. GRB 200109A: Enhanced Swift-XRT position
  17. GRB 200109A: Swift detection of a burst
  18. GRB 200109A: Fermi GBM Final Real-time Localization

Advanced

Download all Circulars as a .tar.gz archive:
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