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').

10 results found.

  1. GRB 100316A: R-band limit
  2. GRB 100316A: optical observations in CrAO
  3. GRB 100316A: TAROT Calern observatory optical observations
  4. GRB 100316A: Swift-XRT refined analysis
  5. GRB 100316A: Swift-BAT refined analysis
  6. GRB100316A: Swift/UVOT Upper Limits
  7. GRB 100316A: Enhanced Swift-XRT position
  8. GRB 100316A: Swift/UVOT Observations
  9. GRB 100316A: Swift-XRT detection
  10. GRB 100316A: Swift detection of a burst

Advanced

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