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"16 results found.
- GRB 241001A: JWST spectroscopic identification of a supernova counterpart
- GRB 241001A: ATCA radio observations
- GRB 241001A: EP-FXT afterglow detection
- GRB 241001A: Swift-XRT afterglow detection
- GRB 241001A : ECLAIRs spectral analysis and XRF classification
- GRB 241001A : SVOM/VT optical detection
- GRB241001A: REM optical/NIR upper limits
- GRB 241001A: GRANDMA and Kilonova-Catcher optical afterglow detection and upper limits
- GRB 241001A: Swift/UVOT Detection
- GRB 241001A: VLT/X-shooter redshift
- GRB 241001A: correction to GCN 37667
- GRB 241001A: Swift-XRT observations
- GRB241001A: optical afterglow candidate
- GRB 241001A: BOOTES-6/DPRT optical upper limit
- GRB 241001A: Swift ToO observations
- GRB 241001A : Detection of a soft transient by ECLAIRs onboard SVOM