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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').

6 results found.

  1. GRB 230913A: CALET Gamma-Ray Burst Monitor detection
  2. GRB 230913A: Glowbug gamma-ray detection
  3. GRB 230913A: Fermi GBM Observation
  4. GRB 230913A: Swift/BAT-GUANO arcminute localization of a burst
  5. Fermi GRB 230913A: Global MASTER-Net observations report
  6. GRB 230913A: Fermi GBM Final Real-time Localization

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Download all Circulars as a .tar.gz archive:
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A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

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