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"

12 results found.

  1. GRB 220701A: Swift-BAT refined analysis
  2. GRB 220701A: MITSuME Akeno optical upper limits
  3. GRB 220701A: COATLI Optical Upper Limit
  4. GRB 220701A: AbAO optical upper limit
  5. GRB 220701A: Keck/LRIS Optical Upper Limit
  6. GRB 220701A: Swift-XRT refined Analysis
  7. GRB 220701A: LCO Optical Upper Limits
  8. GRB 220701A: BOOTES-5/JGT early optical upper limit
  9. GRB 220701A: Swift/UVOT Upper Limits
  10. GRB 220701A: Lowell Discovery Telescope Optical Observations
  11. GRB 220701A: Enhanced Swift-XRT position
  12. GRB 220701A: Swift detection of a burst

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