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 101219B: tentative redshift and spectroscopic supernova detection
  2. GRB 101219B: GROND detection of a SN signature
  3. GRB 101219B: correction
  4. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  5. GRB 101219b. Possible radio afterglow detection.
  6. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  7. GRB 101219B: Swift/UVOT refined analysis
  8. GRB 101219B: Swift-XRT refined Analysis
  9. GRB 101219B: Enhanced Swift-XRT position
  10. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  11. GRB 101219B: Fermi GBM observation
  12. GRB 101219B: Swift-BAT refined analysis
  13. GRB 101219B: Swift detection of a burst with an optical afterglow

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