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"14 results found.
- GRB 110530A: optical observations in Mondy observatory
- GRB 110530A: optical observations at Mt. Terskol, second epoch
- GRB 110530A: Swift-XRT refined Analysis
- GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
- GRB 110530A: Xinglong TNT observation
- GRB 110530A: Enhanced Swift-XRT position
- GRB 110530A: NOT optical observations
- GRB110530A: MITSuME Okayama Optical Observation
- GRB 110530A: optical observations at Mt. Terskol
- GRB 110530A: Correction to GCN Circ 12050
- GRB 110530A: MASTER OT observations
- GRB 110530A: Swift-BAT refined analysis
- GRB 110530A: MITSuME Akeno Optical Observation
- GRB 110530A: Swift detection of a burst with an optical afterglow