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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"

14 results found.

  1. GRB 200925B: OSN Afterglow Candidate Discovery
  2. Fermi GRB 200906A: Global MASTER-Net observations report
  3. GRB 200906A: EMIR/GTC NIR upper limit
  4. GRB 200906A: LBT near-infrared upper limit
  5. GRB 200906A: Swift-BAT refined analysis
  6. GRB 200906A: Swift/UVOT Upper Limits
  7. GRB 200906A: GROWTH-India Telescope (GIT) optical r band upper limit
  8. GRB 200906A: OSN 1.5m Upper Limit
  9. GRB 200906A: Swift-XRT refined Analysis
  10. GRB 200906A: Fermi GBM detection
  11. GRB 200906A: Enhanced Swift-XRT position
  12. GRB 200906A: Nanshan/NEXT optical upper limit
  13. GRB 200906A: Swift detection of a burst
  14. GRB 200906A: 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.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

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