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').

13 results found.

  1. GRB 171123A: TShAO optical upper limit
  2. GRB 171123A: OSN Upper Limit
  3. GRB 171123A: Tautenburg observations
  4. GRB 171123A: Nanshan-1m optical upper limit
  5. GRB 171123A: RATIR Optical and NIR Observations
  6. GRB 171123A: Swift/UVOT Upper Limits
  7. GRB 171123A: GMG observation limit
  8. GRB 171123A: MITSuME Akeno optical upper limits
  9. GRB 171123A: Swift-BAT refined analysis
  10. GRB 171123A: Swift-XRT refined Analysis
  11. GRB 171123A: Confirmation of the X-ray afterglow
  12. GRB 171123A: Enhanced Swift-XRT position
  13. GRB 171123A: 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