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 140408A: MAXI/GSC detection
  2. GRB 140408A: Withdrawal of afterglow candidate
  3. GRB 140408A: 1.5m OSN optical upper limit
  4. GRB 140408A: MITSuME Akeno Optical observation
  5. GRB 140408A: RATIR Optical Upper Limits
  6. GRB 140408A: Swift-BAT refined analysis
  7. GRB 140408A: GROND Detection of an Afterglow Candidate
  8. GRB 140408A: Swift/UVOT Upper Limits
  9. GRB 140408A: Swift-XRT refined Analysis
  10. GRB 140408A: MITSuME Okayama upper limits
  11. GRB 140408A: Enhanced Swift-XRT position
  12. GRB 140408A: Fermi GBM detection
  13. GRB 140408A: 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