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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

16 results found.

  1. GRB 240912A: radio detection with the VLA
  2. Konus-Wind detection of GRB 240912A
  3. GRB 240912A: Swift-BAT refined analysis
  4. GRB 240912A: Swift/UVOT Detection
  5. GRB 240912A: SVOM/GRM observation
  6. GRB 240912A: J-band observations with WINTER
  7. GRB 240912A: Swift-XRT refined Analysis
  8. GRB 240912A: Fermi GBM Observation
  9. Swift GRB 240912A: Global MASTER-Net observations report
  10. GRB 240912A: LCOGT detection and Legacy Surveys likely host galaxy
  11. GRB 240912A : INTEGRAL SPI ACS LIGHT CURVE
  12. GRB 240912A: NOT optical spectroscopy
  13. GRB 240912A: Enhanced Swift-XRT position
  14. GRB 240912A: Redshift from OSIRIS+/GTC
  15. GRB 240912A: Swift detection of a burst with an optical counterpart
  16. GRB 240912A: Fermi GBM Final Real-time Localization

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
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Get involved on GitHub.

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