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 141015A: TAROT La Silla observatory optical observations
- GRB141015A iTelescope observation
- GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
- GRB 141015A: MITSuME Akeno upper limits
- GRB 141015A: Swift/UVOT Upper Limits
- GRB 141015A: MITSuME Okayama upper limits
- GRB 141015A: Swift-BAT refined analysis
- GRB 141015A: LCO-McDonald observations
- GRB 141015A: RATIR Optical Upper Limits
- GRB 141015A: Enhanced Swift-XRT position
- GRB 141015A: Super-LOTIS early observations
- GRB 141015A: ISON-NM early optical observations
- GRB 141015A: Swift/XRT localization
- GRB 141015A: Swift detection of a burst