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 131128A: Bassano Bresciano Observatory optical upper limit
- GRB 131128A; Fermi GBM observation
- GRB 131128A: GROND observations of the afterglow
- GRB 131128A: Swift/UVOT Detection
- GRB 131128A: AROMA-N Optical Observation
- GRB 131128A: Swift-XRT refined Analysis
- GRB 131128A: Kanata/HOWPol optical observation
- GRB 131128A: T100 observations
- GRB 131128A: Swift-BAT refined analysis
- GRB 131128A: Enhanced Swift-XRT position
- GRB 131128A: Nanshan afterglow confirmation
- GRB 131128A: MASTER-Net optical observations
- GRB 131128A: Nanshan afterglow candidate
- GRB 131128A: Swift detection of a burst