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 120907A: optical observations of ISON-Kislovodsk
  2. GRB 120907A: SMA upper limits
  3. GRB 120907A: EVLA observations
  4. GRB 120907A: Swift/UVOT Detection
  5. GRB 120907A: Swift-XRT refined Analysis
  6. GRB 120907A: Spectroscopy from OSIRIS/GTC
  7. GRB 120907A: Enhanced Swift-XRT position
  8. GRB 120907A: Fermi GBM detection
  9. GRB 120907A: Swift-BAT refined analysis
  10. GRB 120907A: NOT optical observations
  11. GRB 120907A MASTER optical observations
  12. GRB 120907A: ROTSE-III Optical Limits
  13. GRB 120907A: Swift detection of a burst with 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

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