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"11 results found.
- GRB 201203A: Zeiss-1000 (Koshka observatory) optical upper limit
- GRB 201203A: 1.3m DFOT, optical upper limits
- GRB 201203A: Swift-BAT refined analysis
- GRB 201203A: GROWTH-India Telescope optical upper limit.
- GRB 201203A: MITSuME Okayama optical upper limits
- Swift GRB 201203A: Global MASTER-Net observations report
- GRB 201203A: Swift-XRT afterglow detection
- GRB 201203A: KAIT Optical Upper Limit
- GRB 201203A: DDOTI Observations
- GRB 201203A: FRAM-Auger optical limit
- GRB 201203A: Swift detection of a burst