Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. 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 160705B: 15 GHz upper limits from AMI
  2. GRB 160705B: TAROT Calern observatory optical observations
  3. GRB 160705B: Swift/UVOT Upper Limits
  4. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  5. GRB 160705B: Swift-BAT refined analysis
  6. GRB 160705B: Swift-XRT refined Analysis
  7. GRB 160705B: Enhanced Swift-XRT position
  8. GRB 160705B: LT optical candidate
  9. GRB 160705B: Swift detection of a burst


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