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').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"111 results found.
- LIGO/Virgo G275404: Fermi GBM Upper Limits
- LIGO/VIRGO G275697: Fermi GBM Observations
- LIGO/Virgo G275404: Fermi GBM Observations
- LIGO/VIRGO G274296: Fermi GBM Observations
- LIGO/Virgo G270580: Fermi GBM Observations
- LIGO/Virgo G268556: Fermi GBM Observations
- LIGO/Virgo G211117: CALET GBM Observations
- LIGO/Virgo G211117: Fermi GBM Observations
- LIGO/Virgo G194575: Fermi GBM Observations
- LIGO/Virgo G194575: Fermi GBM Observations
- LIGO/Virgo G184098: Fermi-GBM ground-based follow-up