Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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. GRB 251103B: Swift-BAT refined analysis
  2. GRB 251103B: AstroSat CZTI detection
  3. GRB 251103B: Swift/UVOT Upper Limits
  4. GRB 251103B: Fermi GBM observation
  5. GRB 251103B: Nanshan/HMT optical upper limit
  6. GRB 251103B: MITSuME Akeno optical upper limits
  7. GRB 251103B: Swift-XRT refined Analysis
  8. Swift GRB 251103B: Global MASTER-Net observations report
  9. GRB 251103B: GROWTH-India Telescope optical upper limits
  10. GRB 251103B: Enhanced Swift-XRT position
  11. GRB 251103B: Prompt enhanced Swift-XRT position
  12. GRB 251103B: Swift detection of a burst
  13. GRB 251103B: Fermi GBM Final Real-time Localization

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

Looking for U.S. government information and services? Visit USA.gov