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"15 results found.
- GRB 051021 Optical Observations
- GRB 051021, Optical Observations
- GRB 051021: PROMPT RcIc Observations
- GRB 051021: Correction
- GRB 051021, SMARTS optical/IR observations
- GRB 051021: P200 Ks Observations
- GRB 051021: MDM Upper Limit
- GRB051021: Swift/UVOT Upper Limits
- GRB 051021,optical observation
- GRB 051021: SOAR NIR Observations
- GRB 051021 : optical afterglow observation at Lulin
- GRB 051021: Optical observations
- GRB 051021: ROTSE-III Confirmation of Optical Counterpart
- GRB 051021: Optical observations and candidate afterglow
- GRB051021: A GRB Localized by HETE