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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"

13 results found.

  1. GRB 200216B: second epoch optical upper limit at Mondy observatory
  2. GRB 200216B: Mondy and AbAO optical upper limits
  3. GRB 200216B: Swift-XRT refined Analysis
  4. GRB 200216B: Swift-BAT refined analysis
  5. GRB 200216B - possible IR counterpart from VLT
  6. GRB 200216B: z-band limit from NOT
  7. GRB 200216B: Fermi GBM observation
  8. GRB 200216B: Swift/UVOT Upper Limits
  9. GRB 200216B: Enhanced Swift-XRT position
  10. GRB 200216B: Nanshan/NEXT early optical upper limit and possible host galaxy
  11. GRB 200216B: GMG upper limit
  12. GRB 200216B: Swift detection of a burst
  13. GRB 200216B: 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.
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Open an issue.
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Get involved on GitHub.

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