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"12 results found.
- GRB050520,optical observation
- GRB 050520: VLT/ULTRACAM observations
- Swift UVOT Observations of GRB 050520
- GRB 050520: Swift XRT refined analysis
- RBO Observations of GRB050520
- GRB 050520: P200 Observations
- GRB 050520: TAROT optical limit
- GRB 050520: Swift XRT position
- GRB 050520: VLT/ULTRACAM observations
- GRB 050520: OSN optical observations
- GRB 050520: BART optical limit
- GRB 050520 - A long GRB detected with INTEGRAL