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"16 results found.
- GRB 111022B: CrAO optical limit
- GRB 111022B: MASTER OT observations
- GRB 111022B: EVLA observations - correction to GCN 12495
- GRB 111022B: EVLA observations
- GRB 111022B: 10.4m GTC z'-band observations
- GRB111022B: D50 optical limit
- GRB 111022B: BTA Optical Observations
- GRB 111022B: Swift/UVOT upper limits
- GRB 111022B, Swift-BAT refined analysis
- GRB 111022B: Swift-XRT refined Analysis
- GRB 111022B: Gemini infrared observations
- GRB 111022B: MITSuME Akeno Optical upper limits
- GRB 111022B: NOT observations
- GRB 111022B: Enhanced Swift-XRT position
- GRB 111022B: MASTER-Net early limit
- GRB 111022B: Swift detection of a burst