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"17 results found.
- GRB 241128A: VIRT Optical Upper Limit
- GRB 241128A: CrAO ZTSh and Mondy AZT-33IK optical observations
- GRB 241128A : RAPAS follow-up observations
- Fermi-GBM Sub-Threshold Detection of GRB 241128A
- GRB 241128A: Swift/UVOT Upper Limits
- GRB 241128A: AbAO optical upper limit
- GRB 241128A: Swift-BAT refined analysis
- GRB 241128A: Mondy optical observations
- GRB 241128A: GRANDMA and Kilonova-Catcher Optical Afterglow Detections and Upperlimits
- Swift GRB 241128A: Global MASTER-Net observations report
- GRB 241128A: Swift-XRT refined Analysis
- GRB 241128A: Enhanced Swift-XRT position
- GRB 241128A: NOT optical observations
- GRB 241128A: LCO optical detection
- GRB 241128A: 1.5m OSN optical afterglow detection
- GRB 241128A: Swift-XRT afterglow detection
- GRB 241128A: Swift detection of a burst