Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. 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').

6 results found.

  1. GRB 130725A: Swift-XRT refined Analysis
  2. GRB 130725A: Swift/UVOT Upper Limits
  3. GRB 130725A - Faulkes Telescope South Observations
  4. GRB 130725A: MITSuME Ishigakijima Optical Observation
  5. GRB 130725A, Swift-BAT refined analysis
  6. Swift Trigger 563980 is GRB 130725A

Advanced

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