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"13 results found.
- GRB 241209B: host galaxy detection and GTC/OSIRIS+ spectroscopy
- GRB 241209B: EP-FXT afterglow detection
- GRB 241209B: SVOM/VT optical continuous fading
- GRB 241209B: GRANDMA/TRT upper limit
- GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations
- Konus-Wind detection of GRB 241209B
- GRB 241209B: GRBAlpha detection
- GRB 241209B: Swift/BAT-GUANO localization skymap of a burst
- GRB 241209B: Swift-XRT afterglow detection
- GRB 241209B: SVOM/VT afterglow detection
- GRB 241209B: BOOTES-5 optical upper limit
- GRB 241209B: Swift ToO observations
- GRB 241209B: SVOM/ECLAIRs and GRM detection of a long burst