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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"15 results found.
- GRB 240910A: LBT optical observations
- GRB 240910A: radio detection with the VLA
- GRB 240910A: further Swift observations and confirmation of afterglow
- GRB 240910A: SVOM/VT optical observations
- GRB 240910A: Redshift from OSIRIS+/GTC
- GRB 240910A: Fermi GBM Observation
- GRB 240910A: NOT optical observations
- GRB 240910A: Swift-XRT detection of GOTO24fvl/AT2024vfp
- GRB 240910A: JinShan optical observations
- GRB 240910A: GOTO candidate optical counterpart
- GRB 240910A: Swift ToO observations
- GRB 240910A: GRBAlpha detection
- GRB 240910A: SVOM/GRM observation
- Fermi GRB 240910A: Global MASTER-Net observations report
- GRB 240910A: Fermi GBM Final Real-time Localization