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"21 results found.
- GRB 171010A: afterglow and SN 2017htp optical observations
- GRB 171010A: possible SN component
- GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
- GRB 171010A: VLA Observations
- GRB 171010A: VLA Detection
- GRB 171010A: A detection of a radio source by AMI
- GRB 171010A : Optical observations from HCT
- GRB 171010A: RATIR Optical and NIR Observations
- GRB 171010A: Swift/UVOT Detection
- Konus-Wind observation of GRB 171010A
- GRB 171010A: ePESSTO NTT spectroscopic redshift
- GRB 171010A: MITSuME Akeno Optical Observation
- GRB 171010A: NOT optical observations
- GRB 171010A: Fermi GBM observation
- GRB 171010A: LCO 1m telescope observations
- GRB171010A: AstroSat CZTI detection
- GRB 171010A: Swift-XRT afterglow detection
- GRB 171010A: optical observations
- GRB 171010A: OT, spectrum, and possible host galaxy
- GRB 171010A: Swift ToO observations
- GRB 171010A: Fermi-LAT detection