Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').

12 results found.

  1. Konus-Wind observation of GRB 190324A
  2. GRB 190324A: Swift/UVOT Observations
  3. GRB 190324A: Insight-HXMT/HE detection
  4. GRB 190324A: Swift-BAT refined analysis
  5. GRB 190324A: CALET Gamma-Ray Burst Monitor detection
  6. GRB 190324A: Swift-XRT refined Analysis
  7. GRB 190324A: Fermi GBM observation
  8. GRB 190324A: Enhanced Swift-XRT position
  9. GRB 190324A: VLT/X-shooter redshift
  10. GRB 190324A: Swift-XRT observations
  11. GRB 190324A: Swift/UVOT afterglow candidate
  12. GRB 190324A: Swift detection of a burst


Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit