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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. GRB220714B: UVOT detections
  2. GRB 220714B: Swift-BAT refined analysis
  3. GRB 220714B: Fermi GBM observation
  4. GRB 220714B: LCO Optical Observations
  5. GRB 220714B: Swift-XRT refined Analysis
  6. GRB 220714B: UVOT afterglow discovery
  7. GRB 220714B: Enhanced Swift-XRT position
  8. GRB 220714B: Swift detection of a burst
  9. GRB 220714B: Fermi GBM Final Real-time Localization

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Download all Circulars as a .tar.gz archive:
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