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"14 results found.
- GRB 120308A : LOAO optical observation
- GRB 120308A: RTT150 optical observations
- GRB 120308A: 1.23m CAHA I-band observations
- GRB 120308A: Further PAIRITEL NIR Observations
- GRB120308A: MITSuME Ishigakijima Optical Upper Limits
- GRB 120308A: Swift/UVOT Detection
- GRB 120308A: Swift-XRT refined Analysis
- GRB 120308A: Enhanced Swift-XRT position
- GRB 120308A: Swift-BAT refined analysis
- GRB 120308A: IAC80 I-band observations
- GRB 120308A: PAIRITEL NIR observations
- GRB 120308A: confirmation of the optical afterglow
- GRB 120308A: Liverpool Telescope optical afterglow candidate
- GRB 120308A: Swift detection of a burst