Skip to main content
New Swift-BAT/GUANO and IceCube Notice Types Available! 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').

7 results found.

  1. GRB 130327B: Swift/XRT source is not the afterglow
  2. GRB 130327B: Suzaku WAM observation of the prompt emission
  3. Swift/XRT observation of GRB 130327B
  4. Konus-Wind observation of GRB 130327B
  5. GRB 130327B: Fermi-LAT detection of a burst
  6. GRB 130327B: Fermi GBM detection
  7. GRB 130327B: gamma-ray detection by AGILE


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