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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. Fwd: GRB 091003: Possible Supernova Component Retraction
  2. GRB 091003: Possible Supernova Component
  3. GRB 091003: Gemini-N redshift of possible host galaxy
  4. GRB 091003: Lick observations and possible SDSS host galaxy
  5. GRB 091003: WHT ACAM observations
  6. GRB 091003: Swift-XRT confirmation of fading afterglow
  7. GRB 091003: Swift/UVOT Detection of an Optical Afterglow
  8. GRB 091003: Skynet/DSO Observations
  9. GRB 091003: UVOT-enhanced XRT position
  10. GRB 091003: Swift UVOT Detection of a Candidate UV Afterglow
  11. GRB 091003: Swift XRT analysis
  12. GRB 091003A: Fermi LAT detection

Advanced

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