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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"

13 results found.

  1. Fermi GBM Sub-Threshold Detection of GRB 250910A
  2. GRB 250910A / EP250910a: VLT limits on the possible associated supernova
  3. GRB 250910A / EP250910a: VLT/X-shooter host galaxy redshift z = 0.592
  4. GRB 250910A: SVOM/ECLAIRs refined analysis
  5. GRB 250910A / EP250910a: Swift-XRT afterglow detection
  6. GRB 250910A / EP250910a: SVOM/VT afterglow confirmation
  7. GRB 250910A / EP250910a : VLT/HAWK-I NIR counterpart discovery
  8. GRB 250910A / EP250910a: VLT/HAWK-I near-infrared observations
  9. EP250910a/GRB 250910A: EP-WXT detection of a fast X-ray transient
  10. GRB 250910A: SVOM/VT optical upper limit
  11. GRB 250910A: LCO optical upper limit
  12. GRB 250910A: SVOM/MXT possible afterglow detection
  13. GRB 250910A: SVOM detection of a faint burst

Advanced

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