Skip to main content
New! Circulars over Kafka, Heartbeat Topic, and Schema v4.1.0. 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').

9 results found.

  1. GRB 071028B Swift-BAT detection of a burst
  2. GRB070227: Swift-XRT refined analysis
  3. GRB 070227: optical observations
  4. GRB 070227: optical observations
  5. GRB 070227: Swift/UVOT Upper Limits
  6. GRB 070227: TAROT La Silla observatory optical observations
  7. GRB 070227, Swift-BAT refined analysis
  8. GRB070227: possible X-ray afterglow detection
  9. GRB 070227: Swift detection of a burst in ground analysis

Advanced

Download all Circulars as a .tar.gz archive:
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