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"11 results found.
- GRB 100713A: second epoch Maidanak optical observation
- GRB 100713A: CrAO optical limits
- GRB 100713A: optical observation in Maidanak
- GRB 100713A: further inspection of TNG images
- GRB 100713A: Swift XRT refined analysis
- GRB 100713A : IRSF/SIRIUS NIR upper limits
- GRB 100713A: GROND upper limits
- GRB 100713A: optical upper limit
- GRB 100713A: TNG optical observations
- GRB 100713A: TELMA and 1.5m OSN optical observations
- GRB 100713A: a long GRB detected by INTEGRAL