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 121212A: LOAO IzY Observation
- GRB 121212A: PdBI mm observations
- GRB121212A: NOT optical imaging
- GRB 121212A: Maidanak optical observations
- GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
- GRB 121212A: PAIRITEL NIR Observations
- GRB 121212A: Swift-XRT refined Analysis
- GRB 121212A: P60 Observations
- GRB 121212A: optical observations in ISON-NM observatory
- GRB 121212A: Keck observations
- GRB121212A: Swift/UVOT Detection
- GRB 121212A: Swift-BAT refined analysis
- GRB 121212A: Enhanced Swift-XRT position
- GRB 121212A: A long GRB detected by INTEGRAL
- GRB 121212A: Swift detection of a burst