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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"18 results found.
- GRB 211023B: LBT likely spectroscopic redshift of the host galaxy
- GRB 211023B: Subaru optical observation
- GRB 211023B: MITSuME Akeno optical upper limits
- GRB 2121023B: 6 GHz VLA radio upper limit
- GRB 211023B: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
- GRB 211023B: Mondy optical afterglow confirmation
- GRB 211023B: Gemini-North Optical Observations
- GRB 211023B: LDT Optical Afterglow Detection
- Possible Short GRB 211023B: CAHA 2.2m Detection
- GRB 211023B: Swift-BAT refined analysis
- GRB 211023B: BOOTES-4/MET and 1.5m OSN optical upper limit
- GRB 211023B: Swift/UVOT Detection
- GRB 211023B: RATIR Optical and NIR Upper Limits
- GRB 211023B: TSHAO optical observation
- GRB 211023B: Swift-XRT refined Analysis
- GRB 211023B: Enhanced Swift-XRT position
- Swift GRB 211023B: Global MASTER-Net observations report
- GRB 211023B: Swift detection of a possibly short burst with an optical counterpart