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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 221110A: GRANDMA observations
  2. GRB 221110A: COATLI Second-Epoch Upper Limits
  3. GRB 221110A: GMG upper limit
  4. GRB 221110A: Swift/UVOT Detection and Corrected UVOT Position
  5. GRB 221110A: Swift-BAT refined analysis
  6. GRB 221110A: Swift-XRT refined Analysis
  7. GRB 221110A: Enhanced Swift-XRT position
  8. GRB 221110A: VLT/X-shooter redshift
  9. GRB 221110A: COATLI Afterglow detection
  10. GRB 221110A: LCOGT Optical Afterglow Detection
  11. GRB 221110A: Swift detection of a burst with an optical counterpart

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

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