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"15 results found.
- Fermi-LAT gamma-ray observations of IceCube-251018A
- IceCube-251018A: Upper limits from a search for additional neutrino events in IceCube
- IceCube-251018A: DDOTI Optical Upper Limit
- GRB 251018A: Fermi GBM Observation
- GRB 251018A: BOOTES-5 and BOOTES-7 early optical detections
- GRB 251018A: Swift-XRT refined Analysis
- GRB 251018A: Enhanced Swift-XRT position
- GRB 251018A: Swift/UVOT Detection
- IceCube-251018A - IceCube observation of a high-energy neutrino candidate track-like event
- IceCube-251018A - IceCube observation of a high-energy neutrino candidate track-like event
- GRB 251018A: MASTER OT detection
- GRB 251018A: TRT optical afterglow detection
- Swift GRB 251018A: Global MASTER-Net observations report
- GRB 251018A: Swift detection of a burst with an optical counterpart
- GRB 251018A: Fermi GBM Final Real-time Localization