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"21 results found.
- GRB 150323C: CrAO optical observations
- GRB 150323C: additional optical observations in Mondy
- GRB 150323C: Khureltogot optical observations
- GRB 150323C: possible host galaxy detection
- GRB 150323C: Nishi-Harima NIR Observations
- GRB 150323C: MITSuME Akeno Optical observation
- GRB 150323C; Konkoly optical observations
- GRB 150323C: Mondy optical observations
- GRB 150323C, Swift-BAT refined analysis
- GRB 150323C: RATIR Optical Afterglow Observations - Errata
- GRB 150323C: Swift/UVOT Upper Limits
- GRB 150323C: Enhanced Swift-XRT position
- GRB 150323C: RATIR Optical Afterglow Observations
- GRB 150323C : Xinglong TNT optical observation
- GRB 150323C: Swift-XRT refined Analysis
- GRB 150323C: Xingming upper limit
- GRB150323C: Fermi GBM detection
- GRB 150323C: Nanshan optical afterglow detection
- GRB 150323C: Prompt enhanced Swift-XRT position
- GRB 150323C: MASTER-net optical observation
- GRB 150323C: Swift detection of a burst