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.
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"
21 results found.
- GRB 250610B: J band upper limit by SYSU 80cm infrared telescope
- GRB 250610B: Swift-XRT refined Analysis
- GRB 250610B: Liverpool Telescope continued monitoring
- GRB 250610B: MISTRAL/T193 and T120 OHP further observations
- GRB 250610B - SVOM/ECLAIRs refined analysis
- Fermi GBM Sub-Threshold Detection of GRB 250610B
- GRB 250610B: Swift/UVOT Detection
- GRB 250610B: SVOM/COLIBRÍ (FM-GFT) optical observations
- GRB 250610B: REM optical/NIR observations
- GRB 250610B: SVOM/VT optical shallow decay
- GRB 250610B: additional Liverpool Telescope optical observations
- GRB 250610B: SVOM/GRM analysis
- GRB 250610B: Fermi/GBM sub-threshold detection of a possibly hard burst
- GRB 250610B: EP-FXT follow-up observation and afterglow counterpart
- GRB 250610B: Swift-XRT counterpart detection
- GRB 250610B: SVOM/VT optical counterpart
- GRB 250610B: LT detection of the optical counterpart
- GRB 250610B: OHP/T120 optical counterpart candidate
- GRB 250610B: GOTO optical upper limit
- GRB 250610B : SVOM/GWAC-F60A and F50 observations
- GRB 250610B: SVOM detection of a long burst