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"12 results found.
- GRB 160917A: Lomonosov BDRG gamma ray detection
- GRB 160917A: 15 GHz upper limits from AMI
- GRB 160917A: Mondy afterglow confirmation
- GRB 160917A: Swift-BAT refined analysis
- GRB 160917A: RATIR Optical and NIR Observations
- GRB 160917A: Fermi GBM observation
- GRB 160917A: Swift/UVOT Detection
- GRB 160917A: Swift-XRT refined Analysis
- GRB 160917A: Mondy optical observations
- GRB 160917A: OSN I-band upper limits
- GRB 160917A: Enhanced Swift-XRT position
- GRB 160917A: Swift detection of a burst