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"18 results found.
- GRB 210210A as a BdHN II
- GRB 180728A: classification of the associated SN 2018fip
- GRB 180728A: MASTER early polarization and 19 days monitoring
- GRB 180728A: discovery of the associated supernova
- GRB 180728A: AstroSat CZTI detection
- GRB 180728A: No evidence of SN in early VLT/X-shooter spectra
- GRB 180728A: A long GRB of the X-ray flash (XRF) subclass, expecting supernova appearance
- GRB 180728A: Swift/UVOT Detection
- Konus-Wind observation of the bright nearby GRB 180728A
- GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
- GRB 180728A: Swift-BAT refined analysis
- GRB 180728A: Fermi GBM observation
- GRB 180728A: Swift-XRT refined Analysis
- GRB 180728A: Enhanced Swift-XRT position
- GRB 180728A: MASTER OT J165415.75-540239.27 is the Optical Counterpart of GRB
- GRB 180728A: Swift-XRT observations
- GRB 180728A: MASTER OT (= new object) detection
- GRB 180728A: Swift detection of a bright burst