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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. Konus-Wind detection of GRB 241115D / EP 241115a
  2. GRB 241115A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 241115a: PRIME near-infrared upper limits
  4. GRB 241115A: Swift-XRT afterglow detection
  5. GRB 241115A: Mephisto upper limits
  6. GRB 241115D / EP 241115a: SVOM/GRM observation
  7. GRB 241115A: Fermi GBM Observation
  8. GRB 241115A: LCOGT Optical Upper Limits
  9. Swift GRB 241115A: Global MASTER-Net observations report
  10. Fermi GRB 241115A: Global MASTER-Net observations report
  11. GRB 241115A: Swift detection of a burst
  12. GRB 241115A: Fermi GBM Final Real-time Localization

Advanced

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