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"16 results found.
- GRB 121209A: LOAO Observation
- GRB 121209A: Swift/UVOT Upper Limits
- GRB 121209A: MAXI/GSC detection
- GRB 121209A: Early CARMA Observations
- GRB 121209A: Keck observations
- GRB 121209A: CARMA 3mm Observations
- GRB 121209A: EVLA Observations
- GRB 121209A: Swift-XRT refined Analysis
- GRB 121209A: Swift-BAT refined analysis
- GRB 121209A: Enhanced Swift-XRT position
- GRB121209A: RATIR Optical and NIR Upper Limits
- GRB 121209A: GROND optical afterglow candidate
- GRB 121209A: Gemini-South imaging
- GRB 121209A: PAIRITEL NIR Observations
- GRB 121209A: UVOT Observation
- GRB 121209A: Swift detection of a burst