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').
26 results found.
- GRB 210619B: Ondrejov D50 detection
- GRB 210420B: Assy optical observations
- GRB 210420B: follow-up photometry of optical afterglow at INASAN/Simeiz
- GRB 210420B: Zeiss-1000 of Koshka optical observations
- GRB 210420B: continued Tautenburg observations
- GRB 210420B: Correction to AST3-3 YaoAn magnitude
- GRB 210420B: follow-up photometry of the optical afterglow at Konkoly
- GRB 210420B: Swift-BAT refined analysis
- GRB 210420B: Swift-XRT refined Analysis
- GRB 210420B: Montarrenti Observatory follow-up observations
- GRB 210420B: Correction to DDOTI Magnitude
- GRB 210420B: Ondrejov D50 optical afterglow detection
- GRB 210420B: RATIR Optical and NIR Observations
- GRB 210420B: Tautenburg observations
- GRB 210420B: Swift/UVOT Detection
- GRB 210420B: KAIT Optical Observations
- GRB 210420B: DDOTI Detection of the Afterglow
- GRB 210420B: update on the BAT trigger time
- GRB 210420B: Redshift from GTC
- GRB 210420B: Multiband photometry from NOT
- GRB 210420B: Montarrenti Observatory optical afterglow detection
- GRB 210420B: AST3-3 YaoAn Optical Observation
- GRB 210420B: BOOTES-4/MET optical afterglow detection
- GRB 210420B: Optical observations
- GRB 210420B: MASTER optical counterpart detection
- GRB 210420B: Swift detection of a burst