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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 210207B: Prompt and very late time observations with HCT.
  2. GRB 210207B: GECAM detection
  3. GRB 210207B: Continued LCO Observations
  4. GRB 210207B: AstroSat CZTI detection
  5. GRB 210207B: Swift/UVOT Detection
  6. GRB 210207B: Swift-BAT refined analysis
  7. GRB 210207B: Insight-HXMT/HE detection
  8. GRB 210207B: LCO Optical Afterglow Detection
  9. GRB 210207B: KAIT Optical Observations
  10. GRB 210207B: AGILE observations
  11. GRB 210207B: Swift-XRT refined Analysis
  12. Konus-Wind detection of GRB 210207B
  13. GRB 210207B: AbAO optical upper limit
  14. GRB 210207B: Enhanced Swift-XRT position
  15. GRB 210207B: optical detection with 3.6m Devasthal Optical Telescope
  16. GRB 210207B: Swift detection of a burst with a bright optical counterpart

Advanced

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