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 171123A: TShAO optical upper limit
- GRB 171123A: OSN Upper Limit
- GRB 171123A: Tautenburg observations
- GRB 171123A: Nanshan-1m optical upper limit
- GRB 171123A: RATIR Optical and NIR Observations
- GRB 171123A: Swift/UVOT Upper Limits
- GRB 171123A: GMG observation limit
- GRB 171123A: MITSuME Akeno optical upper limits
- GRB 171123A: Swift-BAT refined analysis
- GRB 171123A: Swift-XRT refined Analysis
- GRB 171123A: Confirmation of the X-ray afterglow
- GRB 171123A: Enhanced Swift-XRT position
- GRB 171123A: Swift detection of a burst