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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"

11 results found.

  1. GRB 190828B: AstroSat CZTI detection
  2. GRB 190828B: VLT/X-shooter optical afterglow candidate
  3. GRB 190828B: optical upper limit from 0.5m Savelli Robotic Telescope
  4. GRB 190828B: Swift-XRT refined Analysis
  5. GRB 190828B: Swift/UVOT Upper Limits
  6. GRB 190828B: Fermi GBM observation
  7. GRB 190828B: Swift-BAT refined analysis
  8. GRB 190828B: Dabancheng-0.5m optical upper limit
  9. GRB 190828B: Enhanced Swift-XRT position
  10. GRB 190828B: Swift detection of a burst
  11. GRB 190828B: Fermi GBM Final Real-time Localization

Advanced

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