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 160121A: RATIR Optical Observations
- GRB 160121A: TSHAO optical observation
- GRB 160121A: redshift from the 10.4m GTC
- GRB 160121A: RATIR Optical Observations
- GRB 160121A: Swift-XRT refined Analysis
- GRB 160121A: Swift/UVOT Upper Limits
- GRB 160121A: GROND Afterglow observations
- GRB 160121A: TSHAO optical afterglow confirmation
- GRB 160121A: Swift-BAT refined analysis
- GRB 160121A: Enhanced Swift-XRT position
- GRB 160121A: 1.8m MOA optical afterglow detection
- GRB 160121A: MASTER-Amur observations
- GRB 160121A: Swift detection of a burst