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 241112B: Mephisto further optical observations
- GRB 241112B: GMG Optical Upper Limit
- GRB 241112B: AbAO optical upper limit
- Fermi-GBM Sub-Threshold Detection of GRB 241112B
- GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
- GRB 241112B: Swift-XRT afterglow detection
- GRB 241112B: LCO optical detection of the SVOM/VT candidate
- GRB 241112B: SVOM/GRM observation
- GRB 241112B: SVOM/VT afterglow detection
- GRB 241112B: Mephisto optical upper limits
- GRB 241112B: GOTO optical upper limits
- GRB 241112B: Swift ToO observations
- GRB 241112B : detection of a long GRB by SVOM/ECLAIRs