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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"12 results found.
- GRB 131031A: Mondy optical observations
- GRB 131031A: Swift-XRT afterglow confirmation
- GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
- GRB131031A: RATIR Optical and NIR Observations
- GRB 131031A: Fermi GBM detection
- GRB 131031A: Swift/UVOT Upper Limits
- GRB 131031A: MASTER optical observation
- Konus-Wind observation of GRB 131031A
- GRB 131031A: 1.23m CAHA afterglow candidate
- GRB 131031A: Swift-XRT observations
- GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
- GRB 131031A found in ground analysis of BAT data