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 160220A: nIR observations at AAT
- GRB 160220A: Swift-XRT refined Analysis
- GRB 160220A: Swift-BAT refined analysis
- GRB160220A: Swift/UVOT observations
- GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
- GRB 160220A: MASTER-Amur observations
- GRB 160220A: GROND Optical/NIR Upper Limits
- GRB 160220A: Fermi GBM observation
- GRB 160220A: Enhanced Swift-XRT position
- GRB 160220A: Swift-XRT observations
- GRB 160220A: Swift detection of a burst