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.
- GRB 210722A: TAROT Reunion observatory optical light curve
- GRB 210722A: continued Assy optical observations
- GRB 210722A: Nanshan/NEXT further optical observations
- GRB 210722A: continued Assy optical observations
- GRB 210722A: D50 optical detection
- GRB 210722A: Fermi GBM observation
- GRB 210722A: Swift-BAT refined analysis
- GRB 210722A: Kitab optical observations, light curve
- GRB 210722A: Redshift from OSIRIS/GTC
- GRB 210722A: RATIR Optical Observations
- GRB 210722A: Swift-XRT refined Analysis
- GRB 210722A: Swift/UVOT Detection
- GRB 210722A: GIT optical detection and preliminary analysis
- Swift GRB 210722A: Global MASTER-Net observations report
- GRB 210722A: Assy optical detection
- GRB 210722A: Nanshan/NEXT optical afterglow observations
- GRB 210722A: Swift detection of a burst with a bright optical counterpart