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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"

19 results found.

  1. IceCube-241113A: MASTER flaring blazar 5BZB J1311+0853 with Zhirkov effect
  2. GRB 241113A: Possible ATCA Radio detection
  3. EP 241113a: LBT possible optical counterpart
  4. GRB 241113A: Swift-BAT refined analysis
  5. GRB 241113A: PRIME near-infrared upper limits
  6. GRB 241113A: J-band observations with WINTER
  7. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  8. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  9. GRB 241113A: KAIT optical observations
  10. Fermi-LAT gamma-ray observations of IceCube-241113A
  11. GRB 241113A: Swift-XRT refined Analysis
  12. GRB 241113A: Swift/UVOT Detection
  13. GRB 241113A: REM detection of the optical/NIR afterglow
  14. GRB 241113A: LCO optical observations
  15. IceCube-241113A - IceCube observation of a high-energy neutrino candidate track-like event
  16. GRB 241113A: Enhanced Swift-XRT position
  17. GRB241113A: LCOGT (40-cm) optical counterpart detection
  18. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  19. GRB 241113A: Swift detection of a burst with an optical counterpart

Advanced

Download all Circulars as a .tar.gz archive:
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