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"13 results found.
- GRB 170728B: Kottamia R-band observation
- GRB 170728B: 15 GHz upper limits from AMI
- GMRT upper limit on the radio afterglow of GRB 170728B
- GRB 170728B: TShAO, SAO RAS and AbAO optical observations
- GRB 170728B: Swift/UVOT Further Analysis
- GRB 170728B: Optical observations at Crni Vrh
- GRB 170728B: Swift/UVOT Upper Limits
- GRB 170728B, Swift-BAT refined analysis
- GRB 170728B: I-band detection from 1.5m OSN
- GRB 170728B: Enhanced Swift-XRT position
- GRB 170728B: LT afterglow confirmation
- GRB 170728B: position of the TNG optical counterpart
- GRB 170728B: Swift detection of a short burst