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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"

12 results found.

  1. GRB 090817 - TLS Observations
  2. GRB 090817: No host galaxy, no supernova
  3. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  4. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  5. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  6. GRB 090817: Liverpool Telescope Observations
  7. GRB 090817: optical upper limit
  8. GRB 090817: Confirmation of the X-ray afterglow
  9. GRB 090817: Fermi GBM observation
  10. GRB 090817: Swift/UVOT Upper Limits
  11. GRB 090817: Swift-XRT observations
  12. GRB 090817: a long GRB localized by INTEGRAL

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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