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').

15 results found.

  1. GRB 101020A: MASTER prompt and afterglow limit
  2. GRB 101020A: MASTER polarization optical observations
  3. GRB 101008A: correction to the GCN 11352
  4. GRB 101008A: optical observations
  5. GRB 101008A: Fermi GBM observation
  6. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  7. GRB 101008A: MASTER prompt optical observations
  8. GRB 101008A: Swift-BAT refined analysis
  9. GRB101008A, GROND detection of a fading afterglow
  10. GRB 101008A: Swift-XRT refined analysis
  11. GRB 101008A: SAO RAS optical observations
  12. GRB 101008A: Enhanced Swift-XRT position
  13. GRB 101008A: 1.23m CAHA optical observations
  14. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  15. GRB 101008A: Swift detection of a burst

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