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"17 results found.
- GRB110825A: ROTSE early time optical limit
- GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
- GRB 110801A: optical observations at Mt. Terskol observatory
- GRB 110801A: optical observations in CrAO
- GRB 110801A: SAO RAS optical observations
- GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
- GRB 110801A: Evidence for a jet break
- GRB 110801A: MASTER OT observations
- GRB 110801A: Swift-BAT refined analysis
- Swift/UVOT observations of GRB110801A
- GRB 110801A: Swift-XRT refined Analysis
- GRB 110801A: Afterglow redshift from 10.4m GTC
- GRB110801A: MITSuME Ishigakijima Optical Observation
- GRB 110801A: Enhanced Swift-XRT position
- GRB 110801A: TLS Optical afterglow confirmation
- GRB 110801A: ROTSE-III Detection of re-brightening from OT
- GRB 110801A: Swift detection of a burst with an optical counterpart